The correct answer is C because enabling node auto-upgrades ensures that the nodes in your cluster are automatically updated to the latest stable version of Kubernetes without manual intervention. This feature uses the same update mechanism as manual node upgrades, providing benefits such as lower management overhead, better security through automatic application of security updates, and ease of use by keeping nodes up to date with the latest Kubernetes features. Node pools with auto-upgrades enabled are automatically scheduled for upgrades when a new stable Kubernetes version becomes available. Options A, B, and D are incorrect because they either involve manual effort, do not handle upgrades, or do not account for updates post-cluster creation.