An organization is implementing a CI/CD pipeline in GCP for a microservices-based application. The pipeline needs to deploy multiple services in a Kubernetes cluster, manage secrets, and roll back in case of failure. Which combination of GCP services is best for implementing this?

*Explanation: The best combination of GCP services for implementing a CI/CD pipeline for a microservices-based application, including deployment, secret management, and rollback capabilities, is **Cloud Build + GKE + KMS** (Option A. . Cloud Build is a robust CI/CD service that integrates well with Google Kubernetes Engine (GKE) for deploying multiple services in a Kubernetes cluster. Additionally, Key Management Service (KMS) can be used for managing secrets securely. Option B relies on Jenkins, which requires manual management and may not provide the same level of integration and automation as Cloud Build and KMS. Option C suggests using App Engine, which is not as suitable for a microservices-based application compared to GKE. Option D introduces GitLab and Autopilot, which may add unnecessary complexity. Option E involves Spinnaker, which is overkill for standard CI/CD needs and may be too complex for this use case.