What does the $JGA$ (Juxtaglomerular Apparatus) control?

Provide the full names for the following abbreviations:
$(1)$ $JGA$
$(2)$ $ADH$

An increase in blood pressure causes the release of:

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 $ANP$.

What is the significance of the juxtaglomerular apparatus $(JGA)$ in kidney function?

Juxtaglomerular cells of renal cortex synthesize an enzyme called