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You are managing an Oracle Database 11g database with this backup strategy：  - Every Sunday night， level 0 backup is performed.  - On Monday night and subsequent days， level 1 incremental backup is performed.  The backups are not cumulative incremental.  Which statement about Monday’s backup is true（）
A:The backup contains all the used blocks.
B:The backup contains all the used and unused blocks.
C:The backup contains blocks that have changed since the last level 0 backup.
D:The backup contains blocks that have changed since the last level 1 backup taken last week.

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出自：Oracle认证

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