Hormonal Regulation of Sodium Reabsorption

In the context of human physiology, the kidneys play a vital role in homeostasis, particularly in the regulation of blood volume and electrolyte balance. One key process in nephron function is the reabsorption of sodium ions (Na⁺) and water in the proximal convoluted tubule (PCT). Understanding the physiological mechanisms behind these processes can shed light on how the body maintains fluid and electrolyte balance, especially in different states such as hydration and dehydration.

Which of the following hormones primarily regulates the reabsorption of sodium ions in the distal convoluted tubule (DCT) and collecting duct, thereby affecting water reabsorption and overall fluid balance?