Which statement accurately describes the “config rollaback” feature?

A.
Once the “Config rollback” feature is enabled, it allows the administrator to re-apply a previously saved configuration file from the flash

B.
Once the “Config rollback” feature is enabled, it allows the administrator to revert to the prior ScreenOS image or configuration file in event an upgrade operation aborts

C.
The “Config rollback” feature is enabled by default, it allows the administrator to re-reply a previously saved configuration file from flash

D.
Once the “Config rollback” feature is enabled, it allows the administrator to re-apply a locked configuration file from a separate area in flash