Juniper Exam Questions

What are two reasons that would cause this situation?

After configuring OSPF between two routers you check for an adjacency. You see that the adjacencies are not coming up on an Ethernet segment.

What are two reasons that would cause this situation? (Choose two)

A.
You have a mismatched IP subnet/mask

B.
Your hello timer intervals are mismatched

C.
You are not using the same Junos version on each side

D.
You priority values are mismatched