You are responsible for ensuring high availability for a critical application running in a GKE cluster spread across multiple zones. Which of the following should you consider for managing the control plane?

*Explanation:* To ensure high availability for a critical application in a GKE cluster across multiple zones, you should use a Regional cluster. A Regional cluster automatically replicates the control plane across multiple zones, providing redundancy and fault tolerance. This ensures that the control plane remains highly available even if one zone experiences issues. Other options, such as using a Zonal cluster with manual etcd database backup, self-managed control planes, or third-party solutions like Anthos, may introduce complexity or require additional management. Relying on GKE Autopilot doesn't provide direct control over the control plane's configuration. Deploying a multi-master configuration in a Zonal cluster is not recommended as it lacks the inherent redundancy of a Regional cluster.