How should you sit and hold the steering wheel while driving?

• Sit up straight and hold the steering wheel with both hands
  Explanation:

  "You should sit erect, comfortably gripping the outside rim of the steering wheel with both hands."
• Lean forward and grip the steering wheel tightly with both hands
• Lean back and hold the steering wheel with one hand at the top
• Lean back and keep both hands on the bottom of the steering wheel