问题：

[多选]

Examine the following command used to perform incremental level 0 backup:
RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE;
To enable the block change tracking, after the incremental level 0 backup you issued the following command:
SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING
FILE '/mydir/
rman_change_track.f';
To perform incremental level 1 cumulative backup, you issued the following command:
RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;
Which two statements are true in the above situation?（）

A . The block change tracking data will be used only from the next incremental 0 backup.
B . The incremental backup will use change tracking data for accomplishing the backup.
C . The incremental backup will not use change tracking data for accomplishing the backup.
D . The block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.