Which One of the Following Is TRUE Regarding the Sodium-Potassium

Which one of the following is TRUE regarding the sodium-potassium pump?

A) Cholesterol molecules within the plasma membrane pump sodium out of the cell and potassium into the cell.
B) In order to reduce cell volume, the cell decreases the activity of the sodium-potassium pump.
C) Because the sodium-potassium pump works on the principle of diffusion, it does not require energy.
D) Increased activity of the sodium-potassium pump causes an increase in cell volume.
E) In order to maintain a certain cell volume, the sodium-potassium pump exchanges three sodium ions for two potassium ions.