Which of the following backup method must be made regardless of whether Differential or Incremental methods are used? 

Answer options:

A. Full Backup Method.
B. Incremental backup method.
C. Supplemental backup method.
D. Tape backup method.

A

A Full Backup must be made regardless of whether Differential or Incremental methods are used. Source: KRUTZ, Ronald L. & VINES, Russel
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 69. And: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002, chapter 9: Disaster Recovery and Business continuity (pages 617- 619).