To enable faster incremental backups, you enabled block change tracking for the database.Which two statements are true about the block change tracking file?（）
A. Multiple change tracking files can be created for a database.
B. The change tracking file must be created after the first level 0 backup.
C. RMAN does not support backup and recovery of the change tracking file.
D. The database clears the change tracking file and starts tracking changes again, after whole database restore and recovery operations.
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