Which of the following MOST correctly describes a hot spare?

A.
A drive assigned to an array that will only hold parity information used for rebuilding a failed array
drive.

B.
An external hard drive to which all data is replicated to for recovery in the event of a failure.

C.
A drive assigned to an array that will automatically be used to rebuild a failed array drive.

D.
An extra drive purchased and stored in the parts cabinet to replace failed drives.