Click the Exhibit button.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.