Duringaplanningsession，thecustomerindicatesthattheyintendtobuildtwoindependenttwo-Nodeclusters（cluster’A’and’B’）thatwillbeprovidedsharedstorageformanIBMTotalStorageFAStT900server.Thecustomerintendstopresent2LUNstocluster’A’，and2LUNstocluster’B’.Allhostswillbedualattachedviafibre.Whatadditionalhardwareorsoftwareisnecessarytomakethisavalidconfiguration？（）
A.SANswitches
B.FibrechannelHub（s）
C.IBMStorageManagerAgents
D.IBMSubsystemDeviceDriver