Referring to the exhibit, which two statements are true regarding IS-IS adjacencies?

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Referring to the exhibit, which two statements are true regarding IS-IS adjacencies? (Choose two.)
A . Level 1 adjacencies can be formed between Router 3 and Router 4.
B . Level 2 adjacencies can be formed between all routers.
C . Level 2 adjacencies can only be established between Router 1 and Router 2.
D . No IS-IS adjacencies can be formed.

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Answer: AB