Which of the following types of UV rays are emitted by tanning beds?

Tanning beds primarily emit UVA and UVB rays, which are crucial in understanding their effects on skin tanning and potential risks. UVA rays penetrate the skin more deeply and are predominantly responsible for immediate tanning results, while UVB rays contribute to sunburn and play a significant role in developing skin cancer.

In contrast to UVA and UVB rays, UVC rays are mostly absorbed by the Earth's atmosphere and do not reach the surface; they are not typically generated by tanning beds. Similarly, while visible light may be present, it is not primarily associated with the tanning process and does not play a significant role in the tanning effectiveness found in tanning beds.

Thus, the option that suggests tanning beds emit UVA, UVB, and UVC is incorrect since UVC is not a constituent of the tanning process in these environments. Therefore, the correct understanding of the emissions from tanning beds includes mainly UVA and UVB rays, which together affect both the cosmetic tanning effect as well as the potential health risks involved.