Which three tasks are performed by the BACKUP DATABASE command?

You issue the RMAN commands:
RMAN> CONFIGURE DEFAULT DEVICE TYPE TO disk;
RKAN> CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COPY;
RMAN>CONFIGURE CONTROLFILE AUTOBACKUP ON;
RMAN> BACKUP DATABASE PLUS ARCHIVELOG DELETE INPUT;
Which three tasks are performed by the BACKUP DATABASE command?

A.
switching the online redo log file

B.
backing up all data files as image copies and archive log files, and deleting those archive
log files

C.
backing up only the used blocks in the data files

D.
backing up all used and unused blocks in the data files

E.
backing up all archived log files and marking them as obsolete