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You enable block change tracking. You issue the following command：   BACKUP INCREMENTAL LEVEL 0 DATABASE；   The next day，you issue the following command：   BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE；   Which statement about the use of the change tracking file is true？（）  
A: RMAN reads the block change tracking file only when it performs the incremental level 0 backup.
B: RMAN reads the block change tracking file when it performs both incremental backups.
C: RMAN reads the block change tracking file only when it performs the incremental level 1 backup.
D: RMAN does not read the block change tracking file when it performs either incremental backup.

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出自：Oracle认证

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