Which option is the result if two adjacent routers are configured for OSPF with different process IDs?

Which option is the result if two adjacent routers are configured for OSPF with different process IDs?

A.
The routers are unable to establish an adjacency.

B.
The routers establish an adjacency, but route exchange fails.

C.
The routers establish an adjacency and exchange routes, but the routes are unreachable.

D.
The routers establish an adjacency and exchange routes, and the routes are reachable.