An RMAN backup job fails， displaying the following error message： 
ORA­19809： limit exceeded for recovery files 
Your analysis shows that the Flash Recovery area is full. What would you do to resolve the error？（）

A.take the backup of the flash recovery area less frequently
B.increase the value of the UNDO_RETENTION initialization parameter
C.change the value of the WORKAREA_SIZE_POLICY initialization parameter to AUTO
D.change the backup retention policy to retain the backups for a smaller period of time 
E.increase the value of the DB_RECOVERY_FILE_DEST_SIZE initialization parameter
F.increase the value of the CONTROL_FILE_RECORD_KEEP_TIME initialization parameter

A.by using the STATUS command of the Listener control utility
B.by using the STATUS L1 command of the Listener control utility
C.by using the SHOW RULES command of the Listener control utility
D.by using the SET PASSWORD command of the Listener control utility
E.by searching for the PASSWORD_LISTENER entry in the listener.ora file

A.The listener process named L1 will disconnect the unauthorized users.
B.The listener process named L1 will be prevented from being started by unauthorized users. 
C.The listener process named L1 will be prevented from being stopped by unauthorized users. 
D.The listener process named L1 will be prevented from being reloaded by unauthorized users.
E.The listener process named L1 will be prevented from accepting connections from unauthorized users.