At Cooks' Corner, a kitchen equipment store, most employees work less than 40 hours per week. However

Question:

At Cooks' Corner, a kitchen equipment store, most employees work less than 40 hours per week. However only employees who work a minimum of 40 hours per week are eligible for health insurance.
a) Is the action illegal?
b) Does the action violate company or professional standards?
c) Who is affected, and how, by the action?