Click the Exhibit button. Based on the output in the exhibit, which statement is correct?
A.
R3 has been configured so that it is not used for transit traffic.
B.
R3 and R4 have only a level 2 adjacency.
C.
R3 and R4 have an adjacency at both level 1 and level 2.
D.
R4 has been configured with an IS-IS export policy and is announcing external routing
information.