Which of the Following Qualifies as a Guest

Which of the following qualifies as a guest?

A) A diner in a hotel restaurant
B) A business person who attends an all-day meeting at a hotel
C) A person without reservations who enters a hotel hospitality van at the airport, gives the driver luggage, and intends to register as a guest (the hotel has vacancies)
D) One who uses the hotel bathroom on the way to the restaurant