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Which two conditions, when met, allow an IS-IS Level 2 ……

Which two conditions, when met, allow an IS-IS Level 2 router to be considered attached?()

A. You can reach other Level 2 routers.
B. It can reach at least one other defined area.
C. The router is reachable by at least two ES-IS nodes.
D. It has at least one enabled reachable prefix with a valid metric defined.