You issued the following RMAN command： RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON； What is NOT an impact of using the above command？（）
- A When a successful backup is recorded in the RMAN repository， then a backup of the current control file is performed.
- B When a structural change is made to the database， then a backup of the current control file is performed.
- C When a successful backup is performed in the RMAN repository， then a backup of the spfile is performed.
- D When a structural change is made to the database， then a backup of the alert log file will be performed.