Which three issues cause this behavior?

You run the operational-mode command show ospf neighbor and notice that an expected OSPF neighbor on a broadcast link is not detected. Which three issues cause this behavior? (Choose three.)

A.
A problem exists with the physical link or Data Link Layer connectivity.

B.
The router IDs on the two devices do not match.

C.
The IP subnet mask does not match on each end of the link.

D.
The area type does not match on each end of the link.

E.
The AS number on the two devices do not match.