During the propagation of a nerve impluse, the action potential results from the movement of
A. `K^(+)` ions from intracellular fluid to extracellular fluid
B. `Na^(+)` ions from extracellular fluid to intracellular fluid
C. `K^(+)` ions from extracellular fluid to intrecellular fluid
D. `Na^(+)` ions from intracellular fluid to extracellular fluid
