Which part of the nephron is affected by aldosterone?

Given below are two statements.
Statement $I$: Macula densa and $JG$ cells together form the $JG$ apparatus.
Statement $II$: The $JG$ apparatus plays an important role in reabsorption of glucose within kidney.
In the light of above two statements,choose the correct answer from options given below.

The $JGA$ (Juxta Glomerular Apparatus) is a special sensitive region formed by cellular modifications in . . . . . . related to the same nephron.

Urine output is reduced by

Which hormone helps in the reabsorption of water from the kidneys?

$ANF$ (Atrial Natriuretic Factor) is released by