In which location may mop water be disposed of?

The disposal of mop water should be done in a designated location that is appropriate for waste water, which is why using the utility sink is the correct choice. Utility sinks are designed for tasks involving cleaning equipment, including mops, and they provide a proper drainage system to handle the dirty water without contaminating other areas.

Disposing of mop water in a three-compartment sink is not suitable, as this sink is intended for washing, rinsing, and sanitizing food equipment and utensils. The ladies restroom and men's urinal are also not appropriate places for disposing of mop water, as these areas are for personal hygiene and restroom use, not for handling and disposing of cleaning waste. Proper disposal ensures that hygiene standards are maintained and prevents cross-contamination in food service areas.