Before unmounting the datastore, which three requirements must be fulfilled? (Choose three)

An administrator must decommission a datastore.

Before unmounting the datastore, which three requirements must be fulfilled? (Choose three)

A.
No virtual machines reside on the datastore.

B.
The datastore is not used for vSphere HA heartbeat.

C.
The datastore must not have any contents.

D.
The datastore must not be part of a datastore cluster.