Which of the following represents the correct order by which a neuron reaches action potential and returns to resting membrane potential (RMP)?
a. depolarization -> repolarization -> threshold -> hyperpolarization -> RMP
b. hyperpolarization -> repolarization -> threshold -> RMP -> stimulus
c. stimulus -> threshold -> depolarization -> repolarization -> RMP
d. stimulus -> depolarization -> threshold -> repolarization -> RMP