"All or None" Is the Principle Stating That

"All or none" is the principle stating that

A) a neuron either fires or does not fire.
B) a neuron either releases all of its neurotransmitters or it releases none at all.
C) all the dendrites must be receiving messages telling the neuron to fire or it will not fire at all.
D) all somas must be receiving messages telling the neuron to fire or it will not fire at all.