What Is the All-Or-None Law of the Action Potential?​

What is the all-or-none law of the action potential?​

A) An action potential either releases all possible neurotransmitters, or none.
B) ​An action potential excites all the dendrites or none; it cannot select among them.
C) An action potential stimulates all brain areas or none; it cannot select among them.​
D) ​An action potential is a yes/no message; it cannot vary in degree.