The correct answers are Control plane nodes can be physical servers, virtual machines, or cloud compute instances, Run three or seven control plane instances to achieve high availability, and Distribute control plane instances across separate failure domains such as zones or racks to reduce correlated failures.

Control plane nodes can be physical servers, virtual machines, or cloud compute instances is correct because the control plane consists of processes that run on nodes and those nodes may be implemented on bare metal, on virtual machines, or as cloud compute instances. Operators commonly choose VMs or cloud instances for flexibility and they also use physical servers for on premise clusters.

Run three or seven control plane instances to achieve high availability is correct because etcd requires a quorum of members and running an odd number of control plane instances helps maintain quorum during failures. Three is a common minimal HA configuration and seven is used for larger clusters where more redundancy is needed.

Distribute control plane instances across separate failure domains such as zones or racks to reduce correlated failures is correct because placing control plane members in different availability zones or racks reduces the risk that a single infrastructure failure will take down a quorum. Spreading instances across failure domains improves resilience for the control plane and for etcd.

The kubelet process is a component of the control plane is incorrect because the kubelet runs on each node and acts as a node level agent that manages pods on that node. The kubelet is not part of the control plane and it does not provide cluster wide control plane functions.

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