What are the three positions of the rescue boat's engine transmission?

The correct answer identifies the essential operational positions of a rescue boat's engine transmission. While 'Drive' indicates the normal operating mode that propels the boat forward, 'Neutral' is crucial for allowing the engine to run without engaging the propulsion system, which is necessary for stopping the boat without shutting down the engine, for maintenance checks, or for launching and retrieving the boat without movement.

The inclusion of 'Flush' is particularly important as it pertains to the maintenance of watercraft. When the transmission is set to the 'Flush' position, it allows the engine to be run while drawing freshwater through the cooling system, which helps to remove salt or debris that may accumulate during operation in marine environments. This practice extends the life of the engine and ensures optimal performance.

Other options do not include 'Flush' and instead propose combinations that do not accurately reflect all necessary operational states for both navigation and maintenance. Proper understanding of these three positions—Drive, Neutral, and Flush—ensures that users can operate the boat safely and effectively maintain the engine's performance.