A reciprocal agreement is best described how?

A reciprocal agreement is best described how?

A.
A site that has some computers and environmental controls

B.
A site that has fully redundant systems, software, and configurations

C.
A site that is in use by another company already

D.
An agreement that is enforceable

Explanation:
A reciprocal agreement is when one company promises another company
that it can move in if a disaster hits. This agreement is not enforceable.