. Edward is a medical doctor. He was a passenger on a plane from Mexico City to Dallas. While in flight one of the flight attendants came on the intercom and asked the passengers if there was a doctor on board.One of the passengers in first class, Rosalie, was in the throes of a heart attack. Edward volunteered his services. Rosalie was unconscious by the time Edward reached her. Edward saved her life and Rosalie recovered fully. He later sent her a bill for his services.Rosalie maintains that she is not liable for his services. Rosalie is:

1. Correct because she did not ask him to treat her.
2. Correct because he had to treat her because he is a doctor.
3. Incorrect because there was a quasi-contract formed.
4. Incorrect because there was an implied contract formed.
5. None of the above