Which of the following best reflects the site of service?

a. Whether the patient has received, or has not received, any professional, medical, or other healthcare services from the performing physician, or another physician of the exact same specialty and subspecialty who also belongs to the same group practice, during the 3 years prior to the E/M service visit in question
b. The location in which an E/M service visit occurs
c. The disease, traumatic injury, medical condition, illness, undefined symptom, undiagnosed complaint, or any other reason for the E/M service visit
d. The standardized amount of intraservice time usually spent by a physician performing this specific E/M service

b) The location in which an evaluation and management service visit occurs