Which option is valid?

A vSphere administrator wants to upgrade NFS3 datastores to NFS4.1 on ESXi 6.5 hosts with running production virtual machines.

Which option is valid?
A . Run ESXi command to upgrade the datastore.
B . Unmount the datastore from a single host, then mount it as NFS 4.1 datastore, and repeat this one host at a time until the mount has been upgraded on all hosts.
C . Create a new NFS 4.1 datastore, and then use Storage vMotion to migrate virtual machines from the old datastore to the new one.
D . Right click the datastore and upgrade it as a NFS 4.1 datastore.

Answer: C