YouexecutedthefollowingcommandinRecoveryManager(RMAN):RMAN>RESTORECONTROLFILEWhichoperationmustyouperformbeforethiscommandisexecuted?()

YouexecutedthefollowingcommandinRecoveryManager（RMAN）：RMAN>RESTORECONTROLFILEWhichoperationmustyouperformbeforethiscommandisexecuted？()

A.backupthecontrolfiletotrace

B.bringdatabasetotheMOUNTstate

C.openaconnectiontotheRMANrecoverycatalog，whichcontainstheRMANmetadataforthetargetdatabase

D.setthedatabaseID（DBID），butonlyiftheDB_NAMEparameterassociatedwiththetargetdatabaseisuniqueintherecoverycatalog