The Power Relationship Between a Physician and Patient Is Immediately

The power relationship between a physician and patient is immediately evident when the patient enters the doctor's office because

A) it is up to patients to decide when they will see the doctor.
B) the physician is there to greet the patient.
C) patients must wait until a "gatekeeper" admits them to see the doctor in the office's "back region."
D) All of these are correct.