How would you mark a commercial vehicle with an all up weight of more than 12,500 kg?

1. With two light-reflecting stripes on the rear bumper.
2. It is not obligatory to mark a vehicle that doesn’t have a rear wall with light reflectors.
3. Correct answer: With two light-reflecting plates in the rear.
4. With 4 light-reflecting stripes, 2 vertical and 2 horizontal.

WhyA commercial vehicle over 12,500 kg is marked with two light-reflecting plates at the rear.