Cloud Deploy pushes a release to the Dev GKE cluster. You want automatic promotion to the Test cluster when the Dev deploy succeeds. Following Google best practices, how should you configure this?

The correct approach uses a Cloud Function triggered by Cloud Deploy's Pub/Sub notifications. Cloud Deploy publishes messages to the clouddeploy-operations topic when operations like a deployment succeed. A Cloud Function can subscribe to this topic and, upon receiving a SUCCEEDED message for the Dev environment, call the Google Cloud Deploy API to promote the release to the Test cluster. This aligns with best practices for automated promotion in Cloud Deploy. Option 1 is incorrect because Cloud Build is not the primary mechanism for Cloud Deploy promotions; Cloud Deploy's API is designed for this. Option 2 is incorrect because cloud-builds topic relates to Cloud Build events, not Cloud Deploy operation successes. Option 4 is incorrect as it misuses Cloud Build for promotion logic that Cloud Deploy's API handles directly and incorrectly targets the cloud-builds topic.