Which of the following is an example of an exterior functional control switch?

An exterior functional control switch is designed to activate specific functions of a vehicle that are used while the vehicle is operating or maneuvering, typically in response to conditions or needs outside the vehicle. Emergency lights serve this purpose by providing visible alerts to other drivers and pedestrians of a vehicle's presence, especially during emergencies or hazardous situations. They are essential for safety and communication on the road.

In contrast, while sirens, air horns, and turn signals are indeed important functions of a vehicle, they pertain to different categories of operational controls. Sirens and air horns are primarily auditory signals to alert others, while turn signals serve as indicators of the driver's intentions for turning or changing lanes. They help communicate with others on the road, but emergency lights specifically are designed to enhance visibility and safety in potentially dangerous situations outside the vehicle.