How Should the Nurse Palpate the Liver

How should the nurse palpate the liver?

A) Press slowly and firmly over the right costal margin with one hand,and withdraw the fingers quickly after the liver edge is felt.
B) Place one hand on top of the other,and use the upper fingers to apply pressure and the bottom fingers to feel for the liver edge.
C) Place one hand on the patient's back,and press upward and inward with the other hand below the patient's right costal margin.
D) Place one hand under the patient's lower ribs,and press the left lower rib cage forward,palpating below the costal margin with the other hand.