Consider an information system to be created for handling the business of a supermarket. For each of the following, state if it is a possible class. If not, explain why not. Otherwise, why would you consider it to be a class? What is its role in the system?

(a) Customer

(b) Vegetable

(c) Milk

(d) Stock

(e) Canned food

(f) Quantity on hand for a product