In Recovery Manager （RMAN）， you have set control file autobackup to ON by using the following command：  CONFIGURE CONTROLFILE AUTOBACKUP ON;  Which two events would cause the control file to be backed up automatically？ （）

A.a tablespace is taken offline

B.the database instance is restarted

C.a new data file is added to an existing tablespace

D.a successful backup is recorded in the RMAN repository

E.the RMAN connection is disconnected from the target database