Final answer:
Food handlers should not use bare hands to serve bagels; using gloves, clean utensils, or a plastic bag prevents food contamination and poisoning.
Step-by-step explanation:
It is unacceptable for a food handler to serve a bagel from a display case using bare hands. The use of bare hands increases the risk of food poisoning due to a preformed bacterial toxin in food. Gloves, clean utensils, or a plastic bag are better options to maintain hygiene and prevent contamination. Regular handwashing and other safe food handling practices, such as using disposable items like gloves or utensils, are essential in preventing the spread of foodborne illnesses.