An organization keeps backup tapes of its servers at a warm site. To ensure that the tapes are properly maintained and usable during a system crash, the MOST appropriate measure the organization should perform is to:

A. use the test equipment in the warm site facility to read the tapes.
B. retrieve the tapes from the warm site and test them.
C. have duplicate equipment available at the warm site.
D. inspect the facility and inventory the tapes on a quarterly basis.