Which statement Is true regarding the approach in the command?

Examine the following command for RMAN backup:
RMAN> RUN {
ALLOCATE CHANNEL c1 DEVICE TYPE sbt;
ALLOCATE CHANNEL c2 DEVICE TYPE sbt;
ALLOCATE CHANNEL c3 DEVICE TYPE sbt;
BACKUP
INCREMENTAL LEVEL = 0
(DATAFILE 1,4,5 CHANNEL c1)

(DATAFILE 2,3,9 CHANNEL c2)
(DATAFILE 6,7,8 CHANNEL c3);
SQL ‘ALTER SYSTEM ARCHIVE LOG CURRENT’;
}
Which statement Is true regarding the approach in the command?

A.
The RMAN multiplexing level is 4.

B.
It is the use of asynchronous I/O by RMAN.

C.
It is a case of parallelization of the backup set.

D.
It is an implementation of a multisection backup.