Prevent accidental deletion of a production Compute Engine instance. Which setting should you enable?

Enabling delete protection on the instance is the direct and most effective way to prevent accidental deletion. This setting requires an explicit action to disable protection before an instance can be deleted, adding a crucial safeguard. Disabling 'Delete boot disk when instance is deleted' only prevents the boot disk from being deleted, not the instance itself. The instance would still be deleted, leaving a detached boot disk. Disabling Automatic restart prevents the instance from automatically restarting after a crash or maintenance event; it has no bearing on deletion protection. Enabling preemptibility makes the instance much cheaper but also allows Compute Engine to terminate it at any time, which is the opposite of preventing accidental deletion.