Final answer:
An exam that includes a full evaluation of either a single medical specialty or multiple body systems as per EM guidelines is option 3) Both A and B.
Step-by-step explanation:
According to EM (Evaluation and Management) guidelines, an exam that encompasses either a complete single specialty exam or a complete multisystem exam is referred to in option 3) Both A and B. A single specialty exam is thorough and pertains to a specific area of medicine, such as cardiology or neurology, while a multisystem exam is thorough across multiple systems of the body.