Which of the followings is true? Marks O a. Bond prices and yield are positively related. O b. Bond prices are more sensitive to the increases in a yield to maturity than the same amount of declines in a yield to maturity. O c. Price sensitivity to interest rate changes is inversely related to its yield to maturity at which the bond is selling as well as its time to maturity. O d. Prices of high-coupon bonds are less sensitive changes in interest rates than prices of low-coupon bonds