An Action Potential Is Best Defined as _______

An action potential is best defined as _______.

A) the difference in charge across a resting neuron due to the distribution of ions across the neuron's membrane
B) the opening of sodium channels in response to a stimulus
C) the closing of sodium channels and the opening of potassium channels
D) an electrical signal within a neuron caused by the movement of ions
E) None of the above.