What must the administrator do to prevent this from happening again?

An administrator recently upgraded a Cisco Webex DX80 through its web interface but discovered the next morning that the unit had reverted to its previous version.

What must the administrator do to prevent this from happening again?
A . Confirm the phone load name in the phone configuration.
B . Set the prepare cluster for rollback to pre-8.0 enterprise parameter to true.
C . Assign a universal device template to the phone.
D . Assign a phone security profile with secure SI

Answer: A