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.