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.