Click the Exhibit button. Based on the output in the exhibit, which statement is correct?

A.
R3 and R4 are both attached to other IS-IS areas.

B.
R4 has been configured with an IS-IS export policy and is announcing external routing
information.

C.
R3 and R4 have an adjacency at both level 1 and level 2.

D.
R3 has been configured so that it is not used for transit traffic.