What is the most efficient action an administrator should take to ensure it is in a supported state?

An administrator is adding a node with a higher AOS release to an existing cluster.

What is the most efficient action an administrator should take to ensure it is in a supported state?
A . Destroy cluster and foundation with the new node in place
B . Add the node to the cluster and leave the existing AOS version in place
C . Perform standalone reimage of the new node and then add to cluster
D . Add the node to the cluster and reboot all running VMs to use new release

Answer: C