What are the basic configuration steps to enable IS-IS?

What are the basic configuration steps to enable IS-IS?

A.
Configure the net system-id command under router isis and enable IS-IS on each interface with the ip router isis command.

B.
Configure the network net-id command(s) under router isis and enable IS-IS on each interface with the ip router isis command.

C.
Configure the network net-id command(s) and the is-type level-1-2 command under router isis.

D.
Configure the net system-id and the network net-id commands under router isis.

E.
Configure the net system-id and the network net-id commands under router isis and enable IS-IS on each interface with the ip router isis command.