Option (2) is the correct answer because parathyroid hormone is a hypercalcemic hormone i.e, it increases the blood calcium levels. It also increases the absorption of calcium from digested food. Glucocorticoids regulate the carbohydrate metabolism. Option (3) is not the answer because parathyroid hormone stimulates the process of bone resorption. Option (1) and (4) are not the answers because reabsorption of Ca2+ by renal tubules is a function of PTH.