42. After an action potential, the resting potential is restored by (A) the opening of sodium activation gates. (B) the opening of voltage-sensitive potassium channels and the closing of sodium activation gates. (C) an increase in the membrane's permeability to potassium and chloride ions. (D) the delay in the action of the sodium-potassium pump. (E) the refractory period in which the membrane is hyperpolarized.