How is a datastore converted from VMFS5 to VMFS6?

A)  A datastore must be manually converted from VMFS5 to VMFS 6 using vSphere Client.
B)  A datastore must be manually converted from VMFS5 to VMFS6 using the command line.
C)  A datastore is automatically migrated to VMFS6 the first time a VMFS5 datastore is mounted on an ESXI 6.5 host.
D)  VMware vSphere Storage vMotion is used to migrate data on a VMFS5 datastore to a VMFS6 datastore, and then the vacated datastore can be reformatted to VMFS6.

Correct Answer :   VMware vSphere Storage vMotion is used to migrate data on a VMFS5 datastore to a VMFS6 datastore, and then the vacated datastore can be reformatted to VMFS6.