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You are managing an Oracle Database 11g database with the following backup strategy：  1.On Sunday， an incremental level 0 tape backup is performed.  2.Monday through Saturday， acumulativeincremental level 1 tape backup is performed.  Which two statements are true regarding the backups performed（）
A:The backup performed in step 1 backs up all blocks that have ever been in use in the database. 
B:The backup performed in step 2 copies all the blocks changed since the most recent level 0 backup.
C:The backup performed in step 1 backs up all the blocks changed since the most recent level 1 backup.
D:The backup performed in step 2 backs up all blocks that have changed since the most recent incremental backup at level 1.

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出自：Oracle认证

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