Final answer:
A person who registers at a hotel using a false name is not considered a true guest according to the law.
Step-by-step explanation:
The question is asking which of the following choices is not true regarding the legal definition of a guest. The correct answer is c. A person who registers at a hotel using a false name. While a person who has not decided whether to take a room in a hotel can be considered a guest under certain circumstances, and a customer at a bar can also qualify as a guest, using a false name to register at a hotel would not make someone a legitimate guest.