Which of the following statements is (are) true with respect to bond valuation?
I). Spot rates are equal to the yield to maturity of on-the-run coupon paying Treasury securities.
II). The arbitrage-free valuation approach discounts each cash flow of a bond using a different discount rate.
III). As the required yield to maturity increases, the discount on a zero-coupon bond will decrease.
IV). If the yield to maturity on a bond is greater than a bond's coupon rate, then the bond will trade below par.