Liver Descent Is Determined by Percussing the Lower Border of the Liver

Liver descent is determined by percussing the lower border of the liver at the right midclavicular line first as the patient

A) holds a deep breath and then again after the patient exhales.
B) exhales completely after taking a deep breath and then exhales after a normal breath.
C) breathes normally and then again as the patient breathes deeply.
D) holds a deep breath and then after the patient coughs, inhales deeply, and holds his breath again.