The Oracle Cloud Infrastructure (OCI) OS Management service is specifically designed to manage and automate updates and patches for the operating systems on OCI compute instances. It allows administrators to view, install, and manage software packages and apply critical patches, including kernel security updates, across individual instances or groups of instances. This centralized control simplifies the process of maintaining a secure and up-to-date fleet of servers.

A. Container Registry: This service is used for storing, sharing, and managing Docker container images. It does not manage the underlying host operating system or its kernel.

B. Data Safe: This is a unified control center for Oracle Database security. It focuses on data sensitivity, risk evaluation, and activity monitoring, not OS-level patching.

C. Artifact Registry: This service is a repository for storing and managing software development packages (e.g., Maven, npm, Python), not for applying updates to operating systems.

1. Oracle Cloud Infrastructure Documentation, "Overview of OS Management": "The OS Management service allows you to manage and apply updates and patches for the operating system environments on your Oracle Cloud Infrastructure instances... You can use the OS Management service to apply the latest kernel security updates to your instances." (Service: OS Management, Document ID: E94672-20, Section: Overview of OS Management)

2. Oracle Cloud Infrastructure Documentation, "Overview of Container Registry": "Oracle Cloud Infrastructure Registry is an Oracle-managed registry that enables you to simplify your development to production workflow. Registry makes it easy for you as a developer to store, share, and manage development artifacts like Docker images." (Service: Container Registry, Document ID: E94672-20, Section: Overview of Container Registry)

3. Oracle Cloud Infrastructure Documentation, "Overview of Oracle Data Safe": "Oracle Data Safe is a fully-integrated, cloud service that provides a complete and integrated set of features for protecting sensitive and regulated data in Oracle databases." (Service: Data Safe, Document ID: F32820-08, Section: About Oracle Data Safe)

4. Oracle Cloud Infrastructure Documentation, "Overview of Artifact Registry": "Artifact Registry is a repository service for storing, sharing, and managing software development packages. You can create repositories to group similar artifacts." (Service: Artifact Registry, Document ID: E94672-20, Section: Overview of Artifact Registry)

Oracle Cloud Infrastructure (OCI) best practices for high availability (HA) recommend distributing application resources across all Availability Domains (ADs) within a region. Most OCI regions are composed of three ADs. A capacity reservation is a resource that is specific to a single Availability Domain; it cannot span multiple ADs. Therefore, to meet the requirement for high availability and ensure that compute capacity is guaranteed in each location, you must create a separate capacity reservation for each of the three Availability Domains. This ensures that if one AD becomes unavailable, you have pre-allocated capacity to maintain operations in the other two.

A. One: A single reservation only guarantees capacity in one AD, which represents a single point of failure and does not fulfill the high availability requirement across ADs.

B. Two: Reserving capacity in only two ADs does not fully utilize the resilience offered by a three-AD region and leaves the application vulnerable if capacity is unavailable in the third AD.

D. Four: This is incorrect as OCI regions with multiple ADs are architected with three Availability Domains, not four.

1. Oracle Cloud Infrastructure Documentation, Overview of Capacity Reservations: "When you create a capacity reservation, you select an availability domain and a compartment. The reservation provides capacity for instances that match the shape and availability domain that you specify." This confirms a reservation is scoped to a single AD.

Source: Oracle Cloud Infrastructure Documentation, Compute > Capacity Reservations > Overview of Capacity Reservations.

2. Oracle Cloud Infrastructure Documentation, Regions and Availability Domains: "A region is composed of one or more availability domains... To get the highest level of availability for your cloud applications, deploy the applications across multiple availability domains." This establishes the principle of using multiple ADs for HA.

Source: Oracle Cloud Infrastructure Documentation, Key Concepts and Terminology > Regions and Availability Domains.

3. Oracle Cloud Infrastructure Documentation, Best Practices for Your Cloud Topology: "To ensure that your resources have high availability, we recommend that you distribute your resources across the availability domains. For a region that has three availability domains, you can create a VCN with a subnet in each of the three availability domains." This explicitly recommends using all three ADs for HA.

Source: Oracle Cloud Infrastructure Documentation, Best Practices for Your Cloud Topology > High Availability.

OCI Confidential Computing is a security feature designed to protect data while it is actively being processed in memory (data-in-use). It achieves this by creating a hardware-based, highly isolated Trusted Execution Environment (TEE). This environment encrypts the memory used by the virtual machine and isolates the code and data from the hypervisor, firmware, and cloud operator, ensuring that even the cloud provider cannot access the sensitive information being processed. This is the core value proposition of the service.

A. This describes networking services. OCI Confidential Computing is a security feature for compute instances and does not manage or optimize network routing.

B. This describes features of OCI Compute like Instance Pools and Autoscaling configurations, or the Load Balancing service, not Confidential Computing's primary function.

D. This describes storage services like OCI File Storage or Object Storage. These services protect data-at-rest, whereas Confidential Computing specifically protects data-in-use.

1. Oracle Cloud Infrastructure Documentation, "Confidential Computing."

Reference: In the overview section, the documentation states, "Oracle Cloud Infrastructure (OCI) Confidential Computing protects data-in-use. Confidential computing encrypts and isolates data while it's being processed." This directly supports the correct answer (C) by defining the service's primary function as encrypting and isolating in-use data.

2. Oracle Cloud Infrastructure Blog, "Announcing Oracle Cloud Infrastructure Confidential Computing."

Reference: The announcement blog post explains, "Confidential computing is the protection of data in use... OCI Confidential Computing is a flexible and easy-to-use solution that encrypts and isolates customer data and applications that are in use, protecting them from threats and untrusted parties." This reinforces that the key feature is the encryption and isolation of data during processing.

3. Oracle Cloud Infrastructure Documentation, "Overview of Compute."

Reference: This document describes various compute features. The sections on "Autoscaling" and "Instance Pools" detail the capabilities mentioned in option (B), confirming they are separate features from Confidential Computing. Similarly, documentation for "Networking" and "Storage" services covers options (A) and (D), distinguishing them from the security-focused Confidential Computing service.

The Infrequent Access tier is the most suitable choice as it is specifically designed for data that is accessed infrequently but must be available immediately upon request. This tier offers a lower storage cost compared to the Standard tier, fulfilling the cost-minimization requirement. Crucially, it has a minimum retention requirement of 31 days, which perfectly aligns with the specified backup retention period. Data retrieval is immediate, satisfying the accessibility constraint. This combination of lower cost, immediate access, and a matching 31-day minimum retention period makes it the optimal solution for this backup scenario.

A. Archive tier: This tier is incorrect because it does not provide immediate accessibility; data retrieval can take several hours. It also has a 90-day minimum retention period, which would incur cost penalties for a 31-day retention plan.

B. Auto-Tiering tier: While providing immediate access, Auto-Tiering is a feature for optimizing costs for data with unpredictable or changing access patterns. For a predictable workload like backups (infrequently accessed), directly selecting the Infrequent Access tier is more direct and cost-effective.

C. Standard tier: This tier provides immediate access but has the highest storage cost of the "hot" tiers. It does not meet the primary requirement to minimize cost, as a cheaper and equally suitable option (Infrequent Access) is available.

1. Oracle Cloud Infrastructure Documentation - Object Storage Tiers:

Source: Oracle Cloud Infrastructure Documentation, "Overview of Object Storage," section "Object Storage Tiers."

Details: This document explicitly states, "Use the Infrequent Access tier for data that you access infrequently, but that must be available immediately when needed... The minimum retention requirement for objects in the Infrequent Access tier is 31 days." This directly supports the choice of option D. It also describes the Archive tier's retrieval time as "Time to First Byte (TTFB) of 1 hour" and a "minimum retention requirement... of 90 days," invalidating option A. It positions the Standard tier for "data that requires fast, immediate, and frequent access," making it more expensive and thus invalidating option C.

2. Oracle Cloud Infrastructure Documentation - Auto-Tiering:

Source: Oracle Cloud Infrastructure Documentation, "Using Auto Tiering."

Details: The documentation explains that "Auto Tiering monitors data access patterns and automatically moves objects... to the most cost-effective access tier." This is ideal for mixed or unknown workloads, not for a predictable backup workload where the Infrequent Access tier is the known, cost-effective choice from the start, making option B less optimal than D.

The Oracle Cloud Infrastructure (OCI) Web Application Acceleration (WAA) service is a feature integrated with OCI Load Balancing. Its primary function is to enhance the performance of web applications by reducing latency for end-users. It achieves this by employing various optimization techniques, most notably intelligent caching of static content and compression of responses. By serving cached content from the load balancer, it minimizes requests to the backend origin servers, thereby speeding up content delivery and improving the overall user experience.

A. Monitoring and analyzing HTTP traffic patterns is a primary function of OCI Logging, Monitoring, and Web Application Firewall (WAF) services, not Web Application Acceleration.

B. Improving reliability is primarily addressed through load balancer health checks, backend set configurations, and high-availability architecture, not through performance acceleration features like WAA.

C. Encrypting HTTP traffic is managed through SSL/TLS termination on the load balancer, which is a security function separate from the performance-oriented purpose of WAA.

1. Oracle Cloud Infrastructure Documentation, "Overview of Web Application Acceleration." This document explicitly states, "Web Application Acceleration (WAA) is a feature of flexible load balancers and network load balancers that applies various acceleration techniques to improve the performance of web applications." It further details caching and compression as key methods.

2. Oracle Cloud Infrastructure Documentation, "Web Application Acceleration Policies." This section details the configuration of WAA, focusing on caching rules. It states, "A WAA policy tells the load balancer how to cache content from your origin servers," directly supporting the purpose of speeding up traffic through caching.