The All- Or- None Principle, Associated with the Action Potential

The all- or- none principle, associated with the action potential, states that

A) once membrane potential reaches threshold, an action potential will be generated and that action potential will always be the same magnitude.
B) all of the action potentials will be generated from the axon hillock.
C) there is a positive feedback loop for sodium channels that results in a rapid membrane depolarization.
D) the positive feedback loop for the sodium channel is terminated by the inactivation gate.
E) following an action potential, the membrane will be repolarized by the opening of a potassium channel.