Which Azure feature allows you to monitor and log all API calls and administrative actions?

Correct answer: Azure Activity Log

Option C is correct because the Azure Activity Log is the platform-level audit log that records all subscription-level operations including API calls, administrative actions, and resource changes made through the portal, CLI, PowerShell, or REST API, providing a tamper-evident trail for security investigations. Option A is wrong because Azure Application Insights is an application performance monitoring service focused on code-level telemetry such as exceptions and request traces, not on administrative or API-level platform actions. Option B is wrong because Azure Monitor is the umbrella platform that aggregates and analyzes telemetry, but the Activity Log is the specific component within it that captures administrative events; naming Monitor alone is imprecise. Option D is wrong because Azure Log Analytics is a query and analytics workspace for storing and querying log data; it can ingest Activity Log data but is not itself the service that captures API and administrative actions.