You are asked to deploy a large-scale IS-IS network with multiple areas.
In this scenario, which statement is true?
A. A router configured for Level 1 only informs all Level 2 routers in the area of external reachability.
B. A router configured for Level 1 and Level 2 informs all Level 2 routers in the area of external reachability.
C. A router configured for Level 2 only informs all level 1 routers in the area of external reachability.
D. A router configured for Level 1 and Level 2 informs all Level 1 routers in the area of external reachability.
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