What tanning method utilizes tanning beds and booths?

Indoor tanning is the method that specifically utilizes tanning beds and booths. This practice involves the use of artificial ultraviolet (UV) light to achieve a tan without exposing the skin directly to sunlight. Tanning beds typically emit a combination of UVA and UVB rays, which can stimulate melanin production in the skin, leading to a tanned appearance.

Sunless tanning refers to methods that do not involve UV exposure, such as self-tanning lotions, sprays, or airbrush tanning techniques. These products work by applying substances like dihydroxyacetone (DHA) to the skin, which reacts with proteins to create a tanned look.

Natural tanning usually signifies obtaining a tan via direct exposure to sunlight outdoors or in environments with natural light. This method does not involve the use of artificial sources such as tanning beds.

Outdoor tanning is similar to natural tanning and is done in sunlit environments. While both natural and outdoor tanning can lead to a tan, they don't involve the controlled environment and equipment associated with indoor tanning.

Therefore, the correct answer is focused on the specific use of tanning beds and booths that characterize indoor tanning.