You are running only Kubernetes workloads on a worker node that requires maintenance, such as installing patches or an OS upgrade.
Which command must be run on the node to gracefully terminate all pods on the node, while marking the node as unschedulable?
In Kubernetes, kubectl drain gracefully evicts pods from a node, while kubectl cordon prevents new pods from being scheduled on a node. Both commands are used to manage nodes during maintenance or to temporarily take them offline.
D is the correct answer. https://docs.docker.com/engine/swarm/swarm-tutorial/drain-node/
The question is about Kubernetes not swarm so the answer C is correct
C is correct the question taking about Kubernetes