What must be enabled to ensure that VM Component Protection (VMCP) works in a High Availability cluster?

A.
VMware Tools Virtual Machine Communication Interface (VMCI)

B.
Fault Tolerance

C.
Atomic Test and Set (ATS)

D.
All Paths Down (APD) Timeout

Explanation:
There are two types of datastore accessibility failure:
PDL (Permanent Device Loss) is an unrecoverable loss of accessibility that occurs when a storage device reports the datastore is no longer accessible by the host.
This condition cannot be reverted without powering off virtual machines.
APD (All Paths Down) represents a transient or unknown accessibility loss or any other unidentified delay in I/O processing. This type of accessibility issue is
recoverable.
https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.avail.doc%2FGUID-F01F7EB8-FF9D-45E2-A093-5F56A788D027.html