The following statements describe the effects of hormones on renal physiology:

A. Aldosterone increases sodium reabsorption and potassium excretion in the distal tubules, thereby increasing blood volume and GFR.
B. Vasopressin (ADH) acts on the collecting ducts to increase water reabsorption, leading to concentrated urine and a decrease in GFR.
C. Angiotensin II directly constricts efferent arterioles to maintain GFR under conditions of low renal perfusion.
D. Atrial natriuretic peptide (ANP) reduces renal vascular resistance, leading to increased GFR and enhanced sodium excretion.

Which one of the following options represents the correct combination of statements?