Final answer:
The RRD-PRO dimmer can control incandescent bulbs, LED bulbs, and halogen bulbs, demonstrating its versatility in managing different load types. Therefore the correct answer is 4) All of the above
Step-by-step explanation:
The RRD-PRO dimmer can control various types of light bulbs. This includes incandescent bulbs, which are the traditional bulbs with a filament inside, LED bulbs (Light Emitting Diodes), which are more energy-efficient and longer-lasting, and halogen bulbs, which are a type of incandescent bulb that contains a small amount of halogen gas to increase light output and improve lifespan. Hence, the RRD-PRO dimmer is versatile and can be used to control all of the above load types.