This backup method must be made regardless of whether Differential or Incremental methods are
used.

A.
Full Backup Method

B.
Incremental backup method

C.
Differential backup method

D.
Tape backup method

Explanation:
Since the “Full” backup method provides a baseline for our systems for Restore, the full backup must
be done at least once regardless of the method you are using. Its very common to use full backups in
combination with incremental or differential ones to decrease the backup time (however you
increment the restore time), but there is no way to maintain a system only with incremental or
differential backups. You always need to begin from your restore baseline, the Full Backup.