Which meal-type service has a set rate plus the operational charge?

The correct answer is buffet. In a buffet service, customers typically pay a set rate for access to a variety of food items laid out for self-service. This set fee generally covers the cost of the food itself, while the operational charge may encompass expenses such as staffing, maintenance of the food stations, and additional services provided during the meal.

This type of meal service allows for a more communal dining experience and can accommodate various dietary preferences, appealing to a broad audience. Each guest can serve themselves according to their appetite and choice, making it versatile for both casual and formal events. The structure of a buffet helps streamline the dining experience while allowing for full guest satisfaction within a fixed price model.