To protect food from contamination after it is cooked, the best option is:
a. Use single-use gloves to handle the food
Using single-use gloves helps to minimize the risk of contamination from the hands of food workers. While applying hand sanitizer can help, it is not a substitute for proper hand washing and glove usage when handling prepared food. Additionally, leaving food to cool on a clean countertop should be done with care to avoid time-temperature abuse, and placing food on the bottom shelf of the refrigerator does not directly prevent contamination but rather helps with proper food storage.