Which is TRUE about the Na$+,$ K$+$ ATPase pump in neurons?Select one: A$.$ It maintains a concentration gradient for K$+$ such that diffusion forces favor movement of K$+$ into the cell. B$.$ It generates a small electrical potential such that the inside is made negative with respect to the outside. C$.$ It maintains an electrical gradient at the equilibrium potential of K$+.$ D$.$ It transports equal numbers of sodium and potassium ions with each pump cycle. E$.$ It pumps $3$ Na$+$ ions into the cell for every $2$ K$+$ ions it pumps out.