What must be constantly operative on a motorized bicycle?

The correct combination of choices for motorized bicycles includes the requirement for all three components: permanent dipped headlights, rear light, and rear reflector.

According to German traffic regulations (StVZO - Straßenverkehrs-Zulassungs-Ordnung), vehicles must have adequate lighting and visibility equipment for safety reasons, especially during low visibility conditions. The dipped headlights ensure that the rider is seen by others while also illuminating the road ahead. The rear light provides visibility for vehicles approaching from behind, and the rear reflector enhances visibility and safety by reflecting light from other vehicles.

All three components work together to ensure that the motorized bicycle is clearly visible both during the day and at night, which is vital for preventing accidents. Therefore, it is important to ensure that all are operational at all times to comply with legal requirements and enhance road safety.