Although I don't know you, at first glance, you know that you are a military doctor. It is very simple, because you have the demeanor of a doctor, but you are a military man. Which of the following prerequisites should be added to the above reasoning? ['To become a military doctor, you must have both the temperament of a doctor and a soldier.', 'Military doctors are more military than ordinary doctors.', "As long as he is a military doctor, he will definitely show his doctor's grace and military personality.", 'Everyone who has the demeanor of a doctor and the spirit of a soldier must be a military doctor, regardless of his medical skills.']