$A$ fall in glomerular filtration rate activates

If the $ADH$ level in the blood is low,what is the effect on urine volume?

Which of the following would help in the prevention of diuresis?

$JG$ cells of the kidney secrete:

Select the correct option with respect to the following statements:
$(a)$ Angiotensin $II$ constricts arterioles in the kidney to reduce blood flow and decreases blood pressure when blood flow to the afferent arteriole decreases.
$(b)$ Angiotensin $II$ stimulates the adrenal cortex to release aldosterone for more absorption of $Na^+$ and $Cl^-$ ions in the $DCT$.
$(c)$ Blood osmolarity varies with the secretion of aldosterone and $ANP$.

$A :$ Atrial Natriuretic Factor $(ANF)$ is released by the wall of the atria.
$R :$ It inhibits the release of renin from the Juxtaglomerular $(JG)$ apparatus.