You are planning to deploy hundreds of microservices in your Google Kubernetes Engine (GKE) cluster. How should you secure communication between the microservices on GKE using a managed service?

A. Use global HTTP(S) Load Balancing with managed SSL certificates to protect your services B. Deploy open source Istio in your GKE cluster, and enable mTLS in your Service Mesh C. Install cert-manager on GKE to automatically renew the SSL certificates. D. Install Anthos Service Mesh, and enable mTLS in your Service Mesh.