The following table gives yields and durations for three 15-year bonds. The three coupon rates are 0%, 3.5%, and 7%. Which coupon rate belongs to which bond? What is the shape of the term structure of spot rates underlying the valuation of these bonds?

Bond #1 -- Yield: 3.50% -- Duration -- 11.59

Bond #2 -- Yield: 3.50% -- Duration -- 14.75

Bond #3 -- Yield: 3.50% -- Duration 10.26