which is the function of a Backup Verification job?

In vSphere Data Protection 6.1, which is the function of a Backup Verification job?

A.
None. Backup Verification job is not a feature of vSphere Data Protection

B.
It is a manual task
– Power it on
– Verify the guest OS
– Check started applications

C.
It is an automatic process
– Restore a virtual machine
– Power it on
– Verify that the guest OS is booted by communicating with the Backup Verification agent

D.
It is an automatic process
– Restore a virtual machine
– Power it on
– Verify that the guest OC is booted by detecting the VMware ToolsTM “heartbeats”

Explanation:
http://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/vsphere/vmwarevspheredata-protection-overview.pdf (page 11)