Redundancy is:
a. scheduling periodic maintenance to improve availability
b. hiding information to provide confidentiality
c. the provision of surplus service capacity to improve availability
d. none of the above

Option C

Explanation:

Redundancy is the simply the provision of a backup system for an existing system.

Because of safety and protection of important systems and information, redundancy is always a key factor to consider . it is a method of providing a safe,or to prevent a total lose, or shut down of a system , this is achieved by providing "surplus of service capacity to improve availability"as option C explained

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