What is common law? another name for federal law law made by judges through their decisions, not through specific statutes law made by an administrative body law that is guided by the constitution law passed by the u. s. congress?

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.

i am sure the answer is d