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Rays most frequently used in tanning booths:

  1. UVB

  2. UVC

  3. UVA

  4. Infrared

The correct answer is: UVA

UVA rays are the most frequently used in tanning beds because they can penetrate deep into the skin, resulting in a more long-lasting and darker tan. UVB rays, although also used in tanning beds, are primarily responsible for burning the skin. UVC rays are often filtered out by the Earth's atmosphere, and infrared rays are not used in tanning beds as they do not contribute to tanning or burning of the skin.