An administrator is unable to restore a Windows 2008 R2 server to a bootable state on the same hardware. What may be the cause of this problem?

A.
the administrator neglected to back up the Boot Configuration Database volume

B.
the administrator neglected to back up the Windows system state database

C.
the administrator failed to back up the Active Directory membership configuration

D.
the administrator neglected to select the ‘original hardware’ option