Which of the following best describes single-use items?

Single-use items are specifically designed for one-time use and must be discarded afterwards to prevent contamination and ensure hygiene. Option C accurately describes these items as being porous and made from absorbent materials intended for a single use. This aligns with health and safety standards in the cosmetology industry, which mandate the use of single-use items to minimize the risk of infection and promote safety.

In contrast, reusable items made of metal, as mentioned in the first option, indicate materials that can withstand cleaning and sterilization processes for multiple uses, thus contradicting the definition of single-use. The second option refers to porous items designed for multiple uses, which falls outside the single-use category as they are intended to be reused rather than disposed of after one application. Lastly, hard plastic items suitable for more than one client, presented in the fourth option, also do not fit the definition, as these are reusable rather than single-use items.