The iterative process of bootstrapping involves...? a. progressively using spot rates derived from shorter term bond prices to calculate the spot rates implied by the price of longer term bonds. O b. trial and error using interpolation to derive the yield to maturity on a bond when told the bond price. O c. plotting the pure yield curve by deriving the yield to maturity on a series of coupon bonds. O d. a series of calculations which enables the bond issuer to determine the appropriate coupon rate for the bond at the time of issue. O e. determining the term structure of interest rates based on the relative coupon rates and maturities of a series of bonds