What is a prerequisite for unmounting the datastore?

An IT department is decommissioning a storage array and tasks an administrator with removing a datastore from ESXi hosts.

What is a prerequisite for unmounting the datastore? (Choose the best answer.)
A . The datastore is NOT managed by Storage DR
C . The datastore is NOT being used by vSphere High Availability heartbeating.
D . The datastore is NOT referenced by a host profile.
E . The datastore does NOT contain powered-off virtual machines.

Answer: A

Explanation:

Reference: https://kb.vmware.com/s/article/2004605