If you expect interest rate to decrease two years later, which of the following treasury bond is a better investment today if you are going to sell the bond in two years.

		A treasury bond with 20 year maturity and 5% coupon rate.
		A treasury bond with 20 year maturity and 0% coupon rate.
		A treasury bond with 5 year maturity and 5% coupon rate.
		A treasury bond with 5 year maturity and 0% coupon rate.