In a ? primary, voters choose delegates who will represent them at a party convention

Answer

Indirect Primary

Explanation

Indirect Primary election is where members of a party elect delegates to a party convention that in turn elects the party's candidates. This system is now used in some form in all U.S. states, functions as a preliminary election.  It is one of the oldest form of elections and is still used today for many upper houses and presidents. In the Indirect  primary system of election the voters have got limited rights in electing the top leaders of their choice. But instead they elect  the delegates where the delegates now becomes their duty to elect the one they want for the top seat.