Final answer:
A food waste disposal unit installed in a restaurant, commercial, or industrial sink may discharge directly into the drain.
Step-by-step explanation:
A food waste disposal unit installed in a restaurant, commercial, or industrial sink may discharge directly into the drain (Option A). These units are designed to grind food waste into fine particles that can easily pass through the drain and into the sewage system. They are commonly used in commercial kitchens to help manage food waste.