What are the basic configuration steps to enable IS - IS?（）
A. Configure the net system - id command under routerisis and enable IS - IS on each interface with the ip router isis command.
B. Configure the net sy stem - id and the network net - id commands under routerisis.
Configure the network net - id command(s) under routerisis and enable IS - IS on each interface with the ip router isis command.
D. Configure the network net - id command(s) and the is - type level -1- 2 command under routerisis.
E. Configure the net system - id and the network net - id commands under routerisis and enable ISIS on each interface with the ip router isis command.
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