【多选题】
You are managing an Oracle Database 11g database with the following backup strategy： <br /> 1.On Sunday， an incremental level 0 tape backup is performed. <br /> 2.Monday through Saturday， acumulativeincremental level 1 tape backup is performed. <br /> 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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