The axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential?   A. Na+ channels close in a voltage-dependent manner   B. Na+ channels close in a time-dependent manner   C. Na+ channels close in a chemically-dependent manner   D. Na+ channels open in a voltage-dependent manner

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