Within the food service industry $($restaurants that serve meals to customers, but not just fast food$),$ find examples of firms that have sustained competitive advantage by competing on the basis cost leadership, $(2)$ response, and $(3)$ differentiation. Cite one example in each category; provide a sentence or two in support of each choice. $($Hint: A $"99\frac{O}{?}$ menu" is very easily copied and is no good source of sustained advantage.$)$

Choose the correct example of differentiation and its explanation below.

A$.$ Fine dining restaurants, as they have almost the same menu and service.

B$.$ Fine dining restaurants, as they are full service restaurants with specific dedicated meal courses.

C$.$ Institutional food services, such as Sodexho, as they offer food delivery to college campuses.

D$.$ Institutional food services, such as Sodexho, as they get their contracts by being low bidder to provide service.