A nurse is educating a patient on effective sun protection strategies. Which of the following statements by the patient indicates an understanding of these strategies?

Choice A reason: Indoor tanning beds are not safe as they emit concentrated ultraviolet A and ultraviolet B radiation. This exposure significantly increases the risk of DNA damage in skin cells, leading to melanoma and non-melanoma skin cancers. Patients must be taught that artificial UV sources are as hazardous as natural sunlight. Choice B reason: Chemical sunscreens require approximately 15 to 20 minutes to be fully absorbed into the stratum corneum to provide effective photoprotection. Applying it immediately before or after exposure leaves the skin vulnerable to radiation. This statement demonstrates the patient understands the correct pharmacological application timing for maximum ultraviolet protection. Choice C reason: Ultraviolet radiation can damage ocular tissues and the periocular skin even on cloudy or overcast days. Constant use of sunglasses that filter 99% to 100% of UVA and UVB rays is necessary to prevent cataracts and macular degeneration. Limiting use to bright days shows an incomplete understanding. Choice D reason: Sunscreen must be reapplied at least every 2 hours, regardless of activity, because the active ingredients break down over time when exposed to light. Furthermore, sweating and friction from clothing can remove the protective layer. Restricting reapplication only to post-swimming activities significantly increases the risk of solar erythema.