Which of the Following Statements Are True of a Nerve

Which of the following statements are true of a nerve impulse? (Read carefully and select all of the correct statements.)

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.