What Is the Correct Order for the Steps of Synaptic

What is the correct order for the steps of synaptic transmission at the motor end plate? 1. Acetylcholine binds to postsynaptic receptors.
2) Acetylcholine is released by exocytosis.
3) A graded depolarization is produced.
4) An action potential is produced on the muscle cell membrane.
5) Channels that primarily allow diffusion of sodium are opened.
6) Voltage- dependent calcium channels on the plasma membrane open.
7) An action potential arrives at the axon terminal.

A) 7, 6, 2, 1, 5, 3, 4
B) 7, 6, 2, 1, 3, 4, 6
C) 7, 5, 2, 1, 3, 4, 6
D) 6, 7, 2, 1, 3, 5, 4
E) 5, 7, 6, 2, 1, 4, 3