At Resting Potential, the Overall Charge of the Plasma Membrane

At resting potential, the overall charge of the plasma membrane is

A) positive because of the movement of myelin out of a neuron.
B) negative because of the sodium ions being pumped out of a neuron.
C) positive because sodium channels open in the axon but not in the cell body.
D) negative because sodium channels close in the dendrite but not in the axon.