82.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,a cumulative incremental level 1 tape backup is performed. Which two statements are true regarding the backups performed? (Choose two.) 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. 答案：AB 解析：cumulative incremental指的是，它备份上一个级别0备份以来所有发生了变化的块