题目内容：
A.Eachtargetdatabaserequiresitsownrecovercatalog.B.RMANscriptscanbestoredintherecoverycatalogorthetargetcontrolfile.
C.Achannelisastreamofdatatoadevicetypeandcorrespondstooneserversession.
D.TheRMANexecutableinterpretsseversessioncommandsandestablishesconnectionstothetarget database.
参考答案：