You issued the following comman

单项选择题 You issued the following commands to configure setting in RMAN; RMAN> CONFIGURE DEVICE TYPE sbt PARALLELISM 1; RMAN> CONFIGURE DEFAULT DEVICE TYPE TO sbt; RMAN> CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE sbt TO 2; RMAN> CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE sbt TO 2; RMAN> CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2; Then you issued the following command to take the backup: RMAN> BACKUP DATABASE PLUS ARCHIVELOG; Which statement is true about the execution of the above command?（）: A、The backup will terminate because the FORMAT clause was not configured for the channel; B、It backs up two copies of data files to tape and disk, and two copies of archived log file on tape; C、It backs up the data files and archived log files to disk, making two copies of each data file and archived log file; D、It backs up the data files and archived log files to tape, making two copies of each data file and archived log file

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