Candy$-$Corp hires a summer intern to work in the candy shop during the summer. The intern works $20$ hours a week and earns course credit for a course he is taking toward his culinary degree. He is learning a great deal, and at the same time, the company is benefiting from the intern because they did not need to schedule their regular employees full time and they are not paying the intern. What is the legal liability this company is incurring?

a$.$ The summer intern is learning store operations that put him in physical danger.

b$.$ The intern is benefiting the company by replacing duties which could be provided by paid employees.

c$.$ The intern is performing actual work and not just observing.

d$.$ The intern is working too many hours.