Which of the following are not the effects of Parathyroid hormone ? a. Stimulates the process of bone resorption, b. Decreases $Ca^{2+}$ level in blood, c. Reabsorption of $Ca^{2+}$ by renal tubules, d. Decreases the absorption of $Ca^{2+}$ from digested food, e. Increases metabolism of carbohydrates. Choose the most appropriate answer from the options given below