To enable OSPFv2 on an active interface, the router needs an OSPF process and the interface must be placed into an OSPF area. The process ID is locally significant on the router; it starts the OSPF routing process but does not have to match the neighbor. The area ID is different: routers that form an adjacency on the same link must agree on the area, because the area defines the link-state database scope. Authentication keys, stub flags, and IPv6 addressing are not minimum requirements for OSPFv2. MD5 authentication can be added as a security control, but OSPFv2 can run without it. IPv6 belongs to OSPFv3, not OSPFv2. Cisco CCNA 200-301 v1.1 tests OSPFv2 under IP Connectivity, and the basic operational checklist is simple: active interface, matching network type/timers/area where required, and an enabled OSPF process. For this question, the two minimum configured parameters are the OSPF area and the OSPF process ID.