Which of the Following Statements Are True of a Nerve

Which of the following statements are true of a nerve impulse (Select all that apply) ?

A) Depolarization is the reversal of charges on either side of the neuron membrane.
B) The entry of Na+ ions brings about depolarization of a neuron.
C) During repolarization,the negative charge is restored to the outside of the neuron membrane.
D) The entry of K+ ions brings about repolarization.
E) An action potential is polarization followed by depolarization.
F) The maximum speed of a nerve impulse is about 2 feet per second.