Consider an axon of a neuron. At time=t1, its voltage is at threshold for an action potential; at time=t2, its voltage is at 0 millivolts prior to the peak of that action potential. In the time period between t1 and t2 of that single action potential,

A. sodium conductance of the voltage-gated sodium channels increases as membrane voltage increases.

B. sodium conductance of the voltage-gated sodium channels changes with a slower time course than potassium conductance of the voltage-gated potassium channels.

C. the amount of intracellular sodium increases