Select the correct statements from the following.

a. On an average, 1100-1200 mL of blood is filtered by our kidneys per minute. 

b. JGA is a special sensitive region formed by cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact.

c. The ascending limb of loop of Henle is permeable to water but almost impermeable to electrolytes.

d. The collecting duct allows passage of small amounts of urea into the medullary interstitium to keep up the osmolarity.