You issue the following command：   RMAN>CONFIGURE BACKUP OPTIMIZATION ON；   What is the result of this command on your backups？（）

• A、 An incremental backup strategy will be used automatically.
• B、 Read-only datafiles will not be backed up as long as backups of those files already exist and those backups meet established retention criteria.
• C、 RMAN will configure itself for maximum performance at the cost of CPU.
• D、 RMAN will configure itself for minimal OS/CPU impact at the cost of time to back up the database.
• E、 RMAN will automatically compress backups.