A) Na+/K+- ATPase pumps sodium into and potassium out of cells across the basolateral membrane.
B) Na+/K+- ATPase pumps sodium out and potassium into cells across the basolateral membrane.
C) Na+/K+- ATPase pumps sodium out and potassium into cells across the apical membrane.
D) Na+/K+- ATPase pumps sodium into and potassium out of cells across the apical membrane.