The Oracle Cloud Infrastructure (OCI) Load Balancing service is the correct feature for this task. It automatically distributes traffic from a single entry point to multiple backend servers, which can be located in different availability domains within a region. This architecture is fundamental for building fault-tolerant applications. If one availability domain experiences an outage, the load balancer can redirect traffic to the healthy servers in the other availability domains, ensuring high availability and continuous service for end-users.

A. Virtual Cloud Network (VCN) Peering is used to connect two VCNs, enabling private traffic flow between them. It does not distribute incoming application traffic.
B. Route Tables contain rules that direct network traffic from subnets to destinations like gateways or other VCNs. They manage network paths, not application load distribution.
C. An Internet Gateway provides a path for network traffic between a VCN and the public internet. It is a connectivity component, not a traffic distribution mechanism.

1. Oracle Cloud Infrastructure Documentation, "Overview of Load Balancing": "A load balancer improves resource utilization, facilitates scaling, and helps ensure high availability. ... You can distribute traffic across your instances within an availability domain or across availability domains, ensuring that your applications are highly available." (Section: How Load Balancing Works)

2. Oracle Cloud Infrastructure Documentation, "Load Balancer Concepts": "To ensure that your service remains available, you can distribute your backend servers across multiple availability domains. When a load balancer's health check policy detects an unhealthy backend server, it stops sending traffic to that server." (Section: High Availability)

3. Oracle Cloud Infrastructure Documentation, "VCN Peering": "VCN peering is the process of connecting multiple virtual cloud networks (VCNs). With a peering, the VCNs can communicate with each other using private IP addresses without the traffic traversing the internet or your on-premises network." (Section: VCN Peering)