How should you position the adjustable head restraint in your vehicle?

• So that the centre of the head restraint is above your head.
• So that the centre of the head restraint is level with the top of your ears.
  Explanation:

  "For maximum protection against whiplash, the adjustable head restraint should be positioned so that its center aligns with the top of your ears. This helps support your head and neck in the event of a collision."
• So that the centre of the head restraint is below your ears.
• So that the top of the head restraint is level with the top of your ears.