A.Awaytocatalogtapesafteratapebackuptoeasilyidentifyandretrievedata.
B.Amodulartapebackupsystemcontainingmultipledrives，tapes，andconnections.
C.Adatabaseconsistingofallbackupsperformedandthecontentsofeachbackup.
D.Anoffsitestoragefacilitytohousetapesincaseofadisasterforeasysiterecovery.
参考答案：B
