Which OSPF neighbor state confirms the router has reached full adjacency (DR in proper mode)?

The 'Full' state indicates that two OSPF routers are fully adjacent and have synchronized their link-state databases. This is the highest state of adjacency. In a broadcast multi-access network, this state is achieved with the Designated Router (DR) and Backup Designated Router (BDR) for all other routers, and between the DR and BDR themselves. The 'Init' state means a router has received a Hello packet from a neighbor, but it hasn't seen its own Router ID in the neighbor's Hello packet. The '2-way' state signifies that two routers have seen each other's Router IDs in their respective Hello packets, establishing bidirectional communication. On broadcast and NBMA networks, this is the highest state of adjacency for DROthers. The 'Exchange' state occurs after the 2-way state, where routers exchange Database Description (DBD) packets to describe their link-state databases.