Which of the Following Statements Are True of Electrical Changes

Which of the following statements are true of electrical changes at the sarcolemma?
(Read carefully and select all of the correct statements.)

A) A polarized muscle fiber has more Na⁺ ions inside than outside.
B) Depolarization is the movement of K⁺ ions into the cell.
C) Repolarization is the movement of Na⁺ ions out of the cell.
D) A polarized muscle fiber has a positive charge inside and a negative charge outside.
E) Depolarization is a reversal of charges; the cell has a positive charge outside and a negative charge insidE.
F) An action potential is depolarization followed by repolarization.