Its B and D
DR (Designated Router) – On multi-access segments, OSPF routers elect a DR and a BDR, and all other routers on the segment create adjacencies with the DR and the BDR. DR election is based on a router's OSPF Priority, which is a configurable value from 0 (not eligible for DR) to 255.
In IS-IS, all routers establish a full neighbor adjacency with each other (unlike OSPF where routers only form a full neighbor adjacency with the DR/BDR).
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