Besides Proving That a Defendant Was Acting Under Color of Law,which

Besides proving that a defendant was acting under color of law,which of the following must a plaintiff prove in a Section 1983 lawsuit?

A) That there was a violation of a right given by the Constitution
B) That there was a violation of a right given by Federal Law
C) That there was a violation of a right given by State Law
D) Either a violation of a Constitutional right or one given by Federal Law