Study the exhibit carefully. Two directly connected routers are configured with OSPF. The output presented in the exhibit can be seen on the console of one router. What most likely cause this problem?

A.
The maximum transmission unit on either side of the link is not the same

B.
This debug is wrong, OSPF does not exchange DBD packets

C.
This is normal for OSPF running over an FDDI ring

D.
OSPF has received a packet that will not fit in its local buffer, so the packet has been discarded.