What critical driving hazard must a driver be aware of when using a powerful driveline retarder on wet, snow-covered, or icy roads?

1. The retarder may overheat the engine coolant within seconds
2. The sudden retarding torque applied exclusively to the drive axle can cause drive wheel lockup and immediate vehicle jackknifing or skidding
3. The retarder will automatically accelerate the truck downhill
4. The service brake air tanks will instantly lose all air pressure