Proper practices to prevent nontyphoidal Salmonella focus on killing the bacteria with heat, avoiding cross-contamination, and keeping ill workers away. The option that suggests using unwashed hands is not a safe practice; hands can carry Salmonella from raw poultry or eggs and transfer it to ready-to-eat foods, which may be eaten without further cooking. In contrast, cooking poultry and eggs to safe internal temperatures eliminates these bacteria; preventing cross-contamination stops the transfer between raw and ready-to-eat foods; and excluding food handlers diagnosed with the disease removes a potential source of contamination from the kitchen. So, using unwashed hands is the unsafe choice that does not prevent Salmonella.

Removing jewelry from hands and arms reduces contamination risk when handling food. Jewelry can trap dirt and bacteria in tiny gaps, settings, or under bands, and some pieces can loosen or fall into food. Because these contaminants are hard to remove through normal washing, taking off rings, bracelets, and watches before handling food helps keep foods safe. After washing hands, you may use gloves if required for the task, but jewelry itself should be off.

Hand hygiene is the primary defense against spreading infections. You should wash your hands in all the moments listed: before starting work to avoid carrying germs into tasks, after using the restroom to remove germs from the bathroom area, and after actions that can contaminate hands like touching your hair, sneezing, coughing, or rubbing your eyes. Each of these moments presents a risk of transferring germs to yourself, others, or surfaces, so washing is required in all of them. For effective hand washing, wet hands, apply soap, scrub for at least 20 seconds, rinse, and dry, paying attention to the fingertips, between the fingers, and under the nails. If hands aren’t visibly dirty and water isn’t available, an alcohol-based sanitizer can be used as a temporary measure, but washing with soap and water is preferred in these scenarios.

When water is too hot, the cycle dries surfaces quickly and can cook any remaining food particles onto the dishware, causing them to bake on. The heat doesn’t reduce energy use; in fact, hotter water generally uses more energy. A dishwasher starting or refusing to start isn’t usually driven by the water temperature in this way, and while extreme heat can stress dishes and cause cracking in some cases, the most direct and common result described here is baked-on food residue. So this overheat effect best explains why the foods may bake onto the dishware.