Select the correct statement.

The human kidneys can produce urine nearly four times concentrated than the initial filtrate formed. A small amount of urea is transported to the medullary interstitium by the collecting duct. NaCl transported by the ascending limb of Henle’s loop enters the descending limb of vasa recta.  The proximity between the Henle’s loop and vasa recta helps in maintaining an increasing osmolarity towards the inner medullary interstitium.