Which three types of runway lights are commonly used?

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The correct answer identifies key lighting systems that play critical roles in runway operations. Runway end identifier lights (REILs) aid in the identification of the runway's beginning, particularly during low visibility conditions. The runway edge light system delineates the edges of the runway, ensuring pilots can clearly see where the runway ends, especially at night or in adverse weather. In-runway lighting, such as touchdown zone lights, enhances visibility along the runway's length and assists in safe landings.

These lighting systems are essential for pilots as they provide crucial visual cues during takeoff and landing. The combination of these lights enhances safety and operational efficiency by ensuring pilots can accurately navigate during different phases of flight. In contrast, the other options reference various other lighting systems that, while important, do not specifically focus on the types of lights directly associated with runway operations as effectively.