What explanation can you give for why the sodium-potassium pump does not run out of ions to move in or out of the cell?

A)Leak channels are always open,allowing the passage of sodium ions (Na⁺)and potassium ions (K⁺)across the membrane.
B)The cell continuously produces more ions to replace those moved by the pump,maintaining a constant supply.
C)Many of the ions moved in or out then diffuse passively back through the membrane in the opposite direction.