Which two statements regarding compressed backups in Recovery Manager （RMAN） are true？（）
- A Backup compression is disabled by default.
- B Backup compression can be used with both backup sets and image copies.
- C Backup compression cannot be enabled using the CONFIGURE command.
- D Backup compression works only if the COMPATIBILITY parameter is set to 9.0.0.0 or higher.
- E Backup compression applies to only backup sets.
- F Backup compression applies to only image copies.