Suppose that par value of bonds is 100. The price of a 4-year coupon bond paying coupon annually is 105.63. The prices of 1-year, 2-year, 3-year and 4-year zero coupon bond are 99.20, 98.50, 97.00 and 95.00, respectively. Is the 4-year coupon bond priced correctly? If not, is it too high or too low? Is there any arbitrage opportunity? If you are an investment banker, what would you do?