Which two adjacencies are allowed to form when configuring IS-IS? (Choose two.)

A.
a Level 1 router in Area 5 connected to a Level 2 router in Area 5

B.
a Level 1 router in Area 4 connected to a Level 1 router in Area 2

C.
a Level 2 router in Area 4 connected to a Level 2 router in Area 8

D.
a Level 1 router in Area 3 connected to a Level 1 router in Area 3

Explanation: