You are managing a database for which incremental backups can be very time consuming. In order to perform optimized incremental backups you enable the block change tracking feature.How would you instruct RMAN to use the block change tracking feature when performing incremental backups？（）

A. You need to mention it with every BACKUP command.
B. The block change tracking feature is used automatically by RMA
C. You need to configure it using the CONFIGURE command.
D. You need to set the necessary initialization parameters to direct RMAN to use the feature.