Which of the following would BEST support 24/7 availability?

A. Daily backup

B. offsite storage

C. Mirroring

D. Periodic testing

Explanation:

Mirroring of critical elements is a too! that facilitates immediate recoverability. Daily backup implies that it is reasonable for restoration to take place within a number of hours but not immediately. Offsite storage and periodic testing of systems do not of themselves support continuous availability.