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

answer; i believe its called ; checks   and balances;

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.