Which of the Following Parties Would Qualify as a Guest

Which of the following parties would qualify as a guest at a hotel?

A) A person who comes to dine at the restaurant of a hotel and leaves after paying his bill.
B) A person who comes to attend a daylong conference that is being conducted by the management staff of a hotel as a part of its branding campaign.
C) A person who comes to visit a friend who is staying at a hotel and leaves after a couple of hours.
D) A person who lives within a short distance from a hotel but rents a room at the hotel and remains there overnight.