kubelet is the correct option because it is not considered a core control plane process that must operate on every control plane host in a Kubernetes cluster.

The kubelet is the node agent that manages pods and containers on an individual node and it belongs to the node components rather than the control plane. Core control plane components include etcd, the API server, and the scheduler and those are the processes that are expected to run as control plane processes on control plane hosts.

etcd is wrong because it is the cluster key value store that holds cluster state and it runs as a core control plane component on control plane hosts to provide the backing store for the API server.

API server is wrong because it is the central control plane process that exposes the Kubernetes API and it must run on control plane hosts for the cluster to function.

scheduler is wrong because it is the control plane component that assigns pods to nodes and it runs on control plane hosts to make scheduling decisions.

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