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You perform differential incremental level 1 backups of your database on each working day and level 0 backup on Sundays， to tape.  Which two statements are true about differential incremental backups（）
A:The backup performed on Sundays contains all the blocks that have ever been used in the database.
B:The backup performed on Sundays contains all the blocks that have changed since the last level 1backup. 
C:The backup performed on each working day contains all the blocks that have changed since the lastlevel 0 backup.
D:The backup performed on Monday contains all the blocks that have changed since the level 0 backup，and every other working day contains all the blocks that have changed since the level 1 backup.

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出自：Oracle认证

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