Read the given statements and identify the structure of the kidney referred here.
(i) Re-absorption in this region is minimum.
(ii) This region plays a significant role in the maintenance of high osmolarity of interstitial fluid.
(iii) Its descending limb is permeable to water but almost impermeable to electrolytes.
(iv) Its ascending limb is impermeable to water but allows transport of electrolytes actively or passively.