Which two statements are true about Block Media Recovery （BMR）？（）

• A、 BMR increases the Mean Time To Recover （MTTR）.
• B、 BMR can only be implemented using Recovery Manager （RMAN）.
• C、 The blocks that need to be recovered are accessible during BMR.
• D、 BMR cannot be performed using cumulative incremental backups.
• E、 The datafile must be restored if most of the blocks in the datafile are corrupt.