Which of the following processes assist in the maintenance of high levels of dissolved solutes in the interstitial spaces of the kidney medulla?
A. Net flux of sodium ions from intracellular spaces to luminal spaces via sodium- potassium-ATPase pumps located in the luminal membranes of the epithelial cells in the ascending limb of the Loop of Henle.
B. Net flux of sodium from interstitial spaces to intracellular spaces via the sodium- potassium-2chloride co-transporters located in the basolateral membranes of the epithelial cells in the ascending limb of the Loop of Henle.
C. Net flux of sodium ions from luminal spaces to intracellular spaces via the sodium-glucose co-transporters located in the luminal membranes of the epithelial cells in the ascending limb of the Loop of Henle.