Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to control zebra mussels [title] Run your boat twice a week while it's in water. [step] Run the motor as often as possible to prevent mussels from settling inside it. Take it for a 10 to 15 minute drive to heat up the engine.

Ending1: At 30 minutes, when you come to a traffic light or stop sign, cut a half inch to shorten the number of pulses in the water. [substeps] Clip your pitponometer to your inshore dock trailer hitch to keep the fuel from floating in the water over time. Ending2: Also try to hit your boat's top speed to shake off younger mussels. [title] Pull the motor out of the water when it is not in use. Ending3: When it starts up again, tighten the port screws and bay bolts. Put on your large hat and gloves and check your boat's manual or on the sunroof to make sure that everything is operating properly. Ending4: Just be sure it is at a constant steady pulsation range. Avoid turning off your car and park in a well-ventilated spot.

Answer format: ending1/ending2/ending3/ending4