Which of the following is a method to prevent dual deployment?

Controlling the main deployment altitude is essential in preventing dual deployment because it establishes a clear separation between the main and reserve parachute deployments. By ensuring that the reserve parachute is not deployed prematurely or too close to the deployment of the main parachute, skydivers can minimize the risk of both parachutes being deployed simultaneously. This technique relies on proper altitude awareness and timing to execute each parachute deployment at appropriate and distinct heights, thus enhancing safety.

Additionally, while checking equipment after every jump and using heavier pilot chutes may contribute to overall safety and performance, they do not specifically address the issue of preventing dual deployments. Deploying the reserve before the main also poses a higher risk of simultaneous deployment.