A.
Configure the net system - id command under router and enable IS - IS on each intece with the ip router command.
B.
Configure the net sy stem - id and the network net - id commands under router.
C.
Configure the network net - id command(s) under router and enable IS - IS on each intece with the ip router command.
D.
Configure the network net - id command(s) and the is - type level -1- 2 command under router.
E.
Configure the net system - id and the network net - id commands under router and enable on each intece with the ip router command.