【单选题】
You enable block change tracking. You issue the following command：  <br /> BACKUP INCREMENTAL LEVEL 0 DATABASE；  <br /> The next day，you issue the following command：  <br /> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE；  <br /> 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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