题目内容：
A.backupthecontrolfiletotrace
B.bringdatabasetotheMOUNTstate
C.openaconnectiontotheRMANrecoverycatalog，whichcontainstheRMANmetadataforthetargetdatabase
D.setthedatabaseID（DBID），butonlyiftheDB_NAMEparameterassociatedwiththetargetdatabaseisuniqueintherecoverycatalog
参考答案：【答案仅供学习，请勿对照自行用药等】