WhataretheprerequisitesforenablingFlashbackDatabase?()

A.ThedatabasemustbestartedintheMOUNTEXCLUSIVEstate.

B.Thedatabasemusthavemultiplexedcontrolfiles.

C.Thedatabasemustbeopenedbyusingatext-basedparameterfileinsteadofaserverparameterfile（SPFILE）.

D.ThedatabasemustbeinARCHIVELOGmode.

E.ThedatabasemustbeintheNOMOUNTstate.

F.ThedatabasemustbeopenedinRESTRICTEDmode.