Final answer:
A cosmetic spatula is the supply used to remove products from jars in order to maintain proper infection control by preventing direct hand contact with the contents.
Step-by-step explanation:
The supply used to remove products from jars to ensure infection control is a cosmetic spatula. This tool is designed to extract cosmetics or other products from their containers without the need for direct hand contact. Using a cosmetic spatula minimizes the transfer of germs and bacteria, which is crucial in maintaining a hygienic environment. Especially in settings like nail salons, where infection control is paramount, avoiding contaminating products that come into contact with multiple clients is essential. Hence, a cosmetic spatula is the best choice among the options provided, as nail rasp, nail file, and cuticle pusher are instruments used directly on clients and do not serve the purpose of extracting products from jars.