How would an administrator reset a Cisco VCS Control appliance to the default configuration?

A.	Via the CLI, log in as root and issue the factory-reset command.
B.	Via the CLI, log in as root and issue the reset-defaults command.
C.	Via the web GUI, log in as the administrator, choose Backup and Restore, and click the Factory Reset button.
D.	Hold down the power button for 10 seconds until the light flashes.
E.	Hold down the reset button on the back of the appliance for 10 seconds.