[hotel] If a representative of a hotel group offered an existing customer a free night in a hotel property, and when the customer checked into the hotel, the concierge asks the guest to attend a presentation about the hotel group's time share opportunities, this business practice would probably fall into which of the following categories?
a.ethical and legal
b.unethical but legal
c.ethical but illegal
d.unethical and illegal
e.illegal but highly effective