多选题
You issued the RMAN>SHOW ALL； command. The output of the command is as follows：
After analyzing this output， what conclusion can you draw？ （）A If you perform a backup across a network， then the backup will reduce the bandwidth.
B If you perform a backup of a datafile， then the backup will be the same as the operating system copy of the datafile.
C If you perform a backup of a single datafile， then the control file will not be backed up.
D The maximum size of each backup set is 10MB
E The backups will be performed on the disk.
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