In the United States, elections are a fundamental aspect of democracy that allow citizens to express their preferences for public officials. An important element of the electoral process is the concept of a 'primary election.'
Primary elections are held to select a party's candidate for the general election. Different types of primary elections exist in the U.S., including closed primaries, open primaries, and semi-closed primaries. Understanding the different types of primary elections is essential for grasping how political parties operate and how candidates are chosen.
Which of the following statements best defines a 'closed primary'?