When CONFIGURE CONTROLFILE AUTOBACKUP is set to ON， RMAN automatically performs a control file autobackup in which three situations？（）

• A、At the end of every RUN block. 
• B、After every SET CONTROLFILE AUTOBACKUP FORMAT command. 
• C、After every BACKUP or COPY command issued at the RMAN prompt. 
• D、At the end of every RUN block if the last command in the block was either BACKUP or COPY. 
• E、Whenever a BACKUP or COPY command within a RUN block is followed by a command that is neither BACKUP nor COPY. 
• F、After every BACKUP or COPY command within a RUN block that is followed by the CONFIGURE CONTROLFILE AUTOBACKUP FORMAT command.