[多选] You perform differential incremental level 1 backups of your database on each working day and level 0 backupon 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 1 backup.
C . The backup performed on each working day contains all the blocks that have changed since the last level 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 backu

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[多选] You perform differential incremental level 1 backups of your database on each working day and level 0 backupon Sundays， to tape. Which two statements are true about differential incremental backups（）

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