What must be done before performing the initial database backup?

A.
Add the database backup device class name to the dsmserv.opt file.

B.
Add the database backup device class name to the dsmserv.dsk file.

C.
Issue the SET DBDEVCLASS <devclass> command to associate the default device class.

D.
Issue the SET DBRECOVERY <devclass> command to associate the default device class.