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.