which three verification steps should be considered?

When troubleshooting OSPF neighbor errors, which three verification steps should be considered?
(Choose three.)

A.
Verify if neighboring OSPF interfaces are configured in the same area.

B.
Verify if neighboring OSPF interfaces are configured with the same OSPF process ID.

C.
Verify if neighboring OSPF interfaces are configured with the same OSPF priority.

D.
Verify if neighboring OSPF interfaces are configured with the same hello and dead intervals.

E.
Verify if neighboring OSPF interfaces are configured with the same area type.