Which volume.subvolume created on the backup system is a response to the command RDFCOM; INITIALIZE

Which volume.subvolume created on the backup system is a response to the command
RDFCOM; INITIALIZE RDF BACKUPSYSTEM \\BACKUP, SUFFIX A on system \\LIVE?

A.
$AUDIT.BACKUPA

B.
$SYSTEM.LIVEA

C.
$AUDIT.LIVEA

D.
$SYSTEM.BACKUPA