A.Start up only.
B.Restore needed data files， then start up.
C.Complete restore from backup， then start up.
D.Perform point in time recovery， then start up.

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.