A.Adriveassignedtoanarraythatwillonlyholdparityinformationusedforrebuildingafailedarraydrive.
B.Anexternalharddrivetowhichalldataisreplicatedtoforrecoveryintheeventofafailure.
C.Adriveassignedtoanarraythatwillautomaticallybeusedtorebuildafailedarraydrive.
D.Anextradrivepurchasedandstoredinthepartscabinettoreplacefaileddrives.
参考答案：C
