Final answer:
The panel located below the radiator support that deflects air is known as an air dam. It aids in vehicle aerodynamics and cooling efficiency. The correct answer is 'Air dam'.
Step-by-step explanation:
The flexible, air deflecting panel located below the radiator support is known as an air dam. An air dam is designed to reduce the flow of air under the vehicle, which reduces aerodynamic drag and can also help to improve fuel efficiency. It helps to guide the flow of air towards the radiator for better cooling, as well as providing aerodynamic benefits by reducing turbulence under the car. The correct answer to the question is 4) Air dam.