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A
Without any guidance
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B
According to the manufacturer's directions for the specific product
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C
On the eyes
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D
To disinfect tools
Why this is the answer
UV/LED curing lamps used to set (cure) gel nail products should be used according to the manufacturer's directions for the specific gel product and lamp, including correct curing times, because under- or over-curing can affect the result and improper use can cause issues. These curing lamps are for setting gel, not for disinfecting tools. Following product and lamp directions ensures safe, effective application. Knowing the correct purpose and safe use of curing lamps is part of the nail-enhancement content the exam may include.
Source: Skin & Nails — Curing Lamps