Which of the following statements is correct?
Option 1 : The descending limb of loop of Henle is impermeable to water.
Option 2 : The ascending limb of loop of Henle is permeable to water.
Option 3 : The descending limb of loop of Henle is permeable to electrolytes.
Option 4 : The ascending limb of loop of Henle is impermeable to water.
