In the Renal Tubules, Where Is the Na+/K+ Pump Located

In the renal tubules, where is the Na+/K+ pump located?

A) in both the apical and basolateral membranes of intercalated cells
B) in the basolateral membrane of the proximal tubules
C) in the apical membrane of the collecting ducts
D) in both the apical and basolateral membranes of principal cells
E) in the apical membrane of the descending limb of the loop of Henle