5. Using the parametric form of convexity and the example of a two-year coupon bond, coupons being paid at the end of each year, and based on the assumption of annual compounding, mathematically prove, or reject the following statements: (8 Points) (a) Convexity is a decreasing function of yield. (b) Convexity is an increasing function of coupon rate. 5. Using the parametric form of convexity and the example of a two-year coupon bond, coupons being paid at the end of each year, and based on the assumption of annual compounding, mathematically prove, or reject the following statements: (8 Points) (a) Convexity is a decreasing function of yield. (b) Convexity is an increasing function of coupon rate