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You need to perform a block media recovery on the tools01.dbf data file in the SALES database by using Recovery Manager (RMAN). Which two are the prerequisites to perform this operation? （）(Choose two)
A:You must configure block change tracking file
B:You must have first level 1 backups for RMAN to restore blocks
C:You must ensure that the SALES database is mounted or open
D:You must have full or level 0 backups for RMAN to restore blocks
E:You must take the tools01.dbf data file offline before you start a block media recovery

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出自：Oracle认证

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