The Following Events Occur at the Membrane of a Nerve

The following events occur at the membrane of a nerve cell during the generation of an action potential:
1) The potential inside the cell is positive.
2) The potential inside the cell is negative.
3) The threshold potential is reached.
4) Voltage-dependent K⁺ channels open.
5) Voltage-dependent Na⁺ channels open.
Which of the following is a correct sequence for these events?

A) 5, 1, 4, 2, 3.
B) 2, 5, 4, 1, 3.
C) 2, 5, 3, 4, 1.
D) 2, 4, 5, 1, 3.
E) 2, 3, 5, 1, 4.