Answer: Anthos

The correct answer is **Anthos**. Anthos is GCP's modern application management platform that supports building, deploying, and operating applications across various environments, including on-premises and multiple clouds. It specifically includes features for managing service mesh, an infrastructure layer dedicated to controlling and monitoring communication between services in a microservices architecture. - **GKE (Google Kubernetes Engine)** is a managed Kubernetes service for running containerized applications and can be part of Anthos, but it does not offer managed service mesh infrastructure on its own. - **Cloud Build** is a CI/CD platform focused on building and deploying applications, not for service mesh infrastructure. - **Container** refers to a technology for packaging and running applications, not a specific GCP service for managed service mesh. Thus, **Anthos** is the correct choice for managed service mesh infrastructure in GCP.

Author: LeetQuiz Editorial Team