You performed the RMAN database backup with the KEEP option.Which two statements are true about this backup?（） (Choose two)

• A、The KEEP option overrides the configured retention policy
• B、The KEEP option is an attribute of an individual backup piece
• C、The backup contains only data files and archived redo log files
• D、The backup contains data files, the server parameter file and the control file even if the control file auto backup is disabled