Which two statements about the ISIS topology are true?

Refer to the exhibit:

Which two statements about the ISIS topology are true? (Choose two.)
A . All four routers are operating as Level 1 routers only.
B . All four routers are operating as Level 2 routers only.
C . All four routers are operating as Level 1-2 routers.
D . R1 and R2 are Level 2 neighbors.
E . R1 and R4 are Level 2 neighbors

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Answer: C,D