Which of the following are the results of the action of sodium-potassium pumps in a neuron? (select all that apply)
A. There is a buildup of K+ ions inside the cell.
B. A concentration gradient of K+ ions is created.
C. Na+ ions get pumped out of the cell at the same rate at which K+ ions are pumped in.
D. The concentration of Na+ ions increases within the cell and generates electrostatic pressure.