You are architecting a CI/CD pipeline that deploys applications into a Kubernetes cluster on GCP. The pipeline should perform automated testing and only deploy if the tests pass. Which combination of GCP services should you use?

*Explanation:* To set up an efficient CI/CD pipeline for deploying applications into a Kubernetes cluster on GCP, you should use **Cloud Build with Spinnaker for GCP**. Cloud Build allows you to automate the build and test processes, while Spinnaker for GCP provides advanced deployment strategies specifically designed for Kubernetes clusters. This combination ensures automated testing and controlled deployments, allowing you to deploy only when the tests pass. The other options (B, C, D, E) are not well-suited for this specific CI/CD scenario.