2-point question ( of )

Under what circumstances can you carry a child in the rear seat of a car or truck with a maximum permissible weight of 3.5 t, restrained only by seat belts?

If the child is at least 135 cm tall and due to its weight, it is impossible to provide a safety seat or other child restraint system.
If the child is at least 120 cm tall and due to its weight, it is impossible to provide a safety seat or other child restraint system.
If the child is 15 years old.