单项选择题ThecustomerisplanninganewIBMSystemStorageDS5020usingiSCSIanddirectattachedfibrechannelconnectivityinaredundantconfiguration.ThecustomerisplanningtosetupadisasterrecoverysolutioninthenearfuturebyusingEnhancedRemoteMirroring.Whichofthefollowingconsiderationsarecriticalforthiscustomer?()
A.customer must reconfigure aniSCSI port for mirroring
B.customer must set up a fabric and dedicate port 4 for disaster recovery
C.customer must set up a fabric and dedicate port 2 for disaster recovery
D.replication is not possible with the DS5020, they must consider the DS5300