How is a driver required to adjust the vehicle’s head rest?

1. The upper edge of the head-rest should be aligned with the bottom line of the driver’s neck.
2. The lower edge of the head-rest should be aligned with the upper tip of the driver’s head.
3. Correct answer: The upper edge of the head-rest should be aligned with the upper tip of the driver’s head.
4. Proper adjustment of the driver’s head-rest is of no significance.

WhyThe top edge of the head rest is set level with the top of the driver's head.