What is the purpose of Azure's Security Center?

Azure's Security Center is designed to provide a unified security management system that helps organizations protect their Azure resources. It serves as a centralized platform for managing security posture, enabling users to monitor the security state of their services and applications, implement security controls, and respond to threats. This includes recommendations based on best practices, compliance management, threat detection, and security alerts, which helps organizations proactively manage their security efforts across their cloud and hybrid environments.

The other options, while related to aspects of Azure, do not encapsulate the primary purpose of Azure's Security Center. For instance, monitoring user activity logs is a function that could fall under broader security monitoring but does not represent the unified management aspect. Tracking server performance metrics relates more to operational oversight rather than security management, and managing access to Azure subscriptions, while important, is a function more closely associated with Azure Role-Based Access Control (RBAC) rather than the overall purpose of the Security Center.