You have implemented multiple services using GCP's API Gateway and you want to monitor the API calls for unauthorized or suspicious activity. Which GCP service should you use to accomplish this?

*Explanation:* A. Incorrect, Cloud Endpoints is more for creating, deploying, and managing APIs. B. Incorrect, Cloud Logging is for logging but doesn't provide the security analytics required. C. Incorrect, Stackdriver Monitoring is for monitoring performance metrics. D) Incorrect, Cloud Trace is for latency information. E) Correct, Cloud Security Command Center provides security analytics and can be configured to alert for suspicious activity.