Which two steps should the administrator review to help resolve the issue?

Backups of a newly added Windows Server 2008 guest virtual machine are failing with the following status:

156: snapshot error encountered

The associated bpfis process log indicates that the attempt to quiesce this virtual machine failed.

Which two steps should the administrator review to help resolve the issue? (Select two.)
A . VMware Tools is installed and running in the virtual machine
B . disable Block-Level Incremental Backup in the policy
C . install the NetBackup plug-in for vSphere Web Client on the guest virtual machine
D . verify Microsoft Volume Shadow Copy Service within the guest virtual machine is working properly
E . enable snapshotting of the virtual machine’s memory on the vCenter server

Answer: A, D