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The purpose of a latch bolt is to secure a door in the closed position. A latch bolt is a type of locking mechanism that is typically spring-loaded, allowing it to be engaged automatically when the door closes. This mechanism ensures that the door remains shut until the latch is disengaged, usually by turning a doorknob or using a key in a locking system.

By keeping the door securely closed, the latch bolt plays a crucial role in maintaining privacy and security for the space it protects. It effectively prevents unauthorized entry while still allowing for ease of access when the mechanism is properly operated.

The other choices, while related to door function, do not accurately describe the primary role of a latch bolt. For instance, while it may contribute to easy door opening when used in conjunction with a doorknob or lever, that is not its fundamental purpose. Automatic locking is typically a function of a deadbolt rather than a latch bolt, and preventing doors from closing contradicts the intended functionality of a latch bolt as it is designed to secure the door when closed.