Your team is building a microservices-based application on GCP, and you need to implement service-to-service communication securely and efficiently. What GCP service can you use to manage this communication while following best practices?

*Explanation:* The correct option is B. Google Cloud Endpoints for API management and authentication. Google Cloud Endpoints provides tools for building APIs and securing communication between microservices. Option A mentions load balancer, which may not handle service-to-service communication efficiently. Option C is for messaging, not direct service communication. Option D is for network-level connections, not service-to-service.