— Exhibit — — Exhibit — Click the Exhibit button. You notice that there is a problem with the
OSPF adjacency between two routers, R1 and R2. The relevant system logs from R1 are
shown in the exhibit. What would cause this behavior?

A.
R2 was dropping R1’s OSPF hello packets.

B.
R1 was dropping R2’s OSPF hello packets.

C.
R1’s interface went down and came back up.

D.
There is an OSPF hello timer mismatch between the two routers.