Which three OSPF parameters must match before two devices can establish an OSPF adjacency? (Choose three.)

While routers need IP addresses to communicate, the specific IP address *values* themselves (as long as they are in the same subnet) do not need to be identical to form an adjacency.

Interface cost is an OSPF metric for path selection and does not prevent or enable adjacency formation itself.

OSPF neighbors must be on the same IP subnet, meaning their interface subnet masks for the connecting link must match for successful IP communication and OSPF Hello exchange.

The OSPF process ID is locally significant to the router and does not need to match between neighbors for adjacency to form.

OSPF routers exchange Hello packets containing their Hello and Dead timer intervals, and these settings must match between neighbors for adjacency to form and maintain consistency.

OSPF adjacencies are formed within a specific OSPF area, so the area number configured on the interfaces of two potential neighbors must match.