Which AKS upgrade concept lets you validate a new Kubernetes version on a subset of nodes before committing?
- A Blue-green node pools: add a new pool on the target version and migrate workloads (correct answer)
- B In-place control plane upgrade only
- C Deleting and recreating the cluster
- D Enabling the cluster autoscaler
Shortcut: Creating a second node pool on the new version and cordoning/draining the old one gives a reversible, incremental migration path with a clear rollback.