问题：

[单选]

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