Which of the following statements about Bond ratings are true? o 0 U.S. Treasury Bonds are not rated 0 A bond's credit rating can change as the issuer's financial strength improves or declines. Bond ratings are concerned only with the possibility of default. All of the above. Only a, and c. above Question 9 2 pts To understand the pricing of bonds it is important to understand the relationship between the bond's coupon rate and the yield to maturity (YTM). Which of the following is true? If the YTM is greater than the coupon rate, then par value is greater than the bond price. Therefore, the bond is selling at a discount a 0 If the YTM = the coupon rate, then par value = bond price. If the YTM is less than the coupon rate, then par value is less than the bond price. Therefore, the bond is selling at a premium All of the above. None of the above