Microsoft Entra (specifically Microsoft Entra ID) provides the core identity and access management services for Microsoft 365. It secures data by controlling who can access resources through authentication, authorization, and features like Conditional Access and Multi-Factor Authentication (MFA). Microsoft Exchange Online includes built-in security services, most notably Exchange Online Protection (EOP), which protects against spam, malware, and other email-based threats. It also integrates with advanced security and compliance features like Data Loss Prevention (DLP) and message encryption to secure sensitive information within emails and attachments.

B. Microsoft Delve: This is a content discovery tool that surfaces information to users based on existing permissions; it is not a primary data security application.
D. Microsoft 365 Copilot: This is an AI-powered productivity assistant that operates within the existing security and compliance boundaries but is not a security service itself.

1. Microsoft Learn. (2024). What is Microsoft Entra ID? "Microsoft Entra ID is a cloud-based identity and access management service... It provides an identity and access management (IAM) solution that connects employees to their apps, devices, and data." Section: Introduction.

2. Microsoft Learn. (2024). Exchange Online Protection overview. "Exchange Online Protection (EOP) is the cloud-based filtering service that helps protect your organization against spam and malware." Section: Introduction.

3. Microsoft Learn. (2024). Data, Privacy, and Security for Microsoft Copilot for Microsoft 365. "Copilot for Microsoft 365 is built on Microsoft's comprehensive approach to security, compliance, and privacy... It automatically inherits your organization's security, compliance, and privacy policies for Microsoft 365." Section: Introduction.

4. Microsoft Learn. (2023). What is Microsoft Delve? "Microsoft Delve is a data visualization and discovery tool... Delve never changes any permissions, so users will only see what they already have access to." Section: How does Microsoft Delve know what's relevant to me?