Click the Exhibit Button

Click the Exhibit button. A router is attempting to form an OSPF neighborship with another router. However, the OSPF neighborship fails to establish completely. Referring to the exhibit, what is the problem?

A) There is an interface type mismatch.
B) There is an OSPF area mismatch.
C) There is an interface subnet mask mismatch.
D) There is an interface MTU mismatch.