You have an obligation to pay $148 in four years and 2 months. In which bond would you invest your $100 to accumulate this amount, with relative certainty, even if the there is a parallel shift in the term structure of interest rates? All bonds pay interest annually and have a face value of $100

a.a 6-year; 10% coupon par value bond

b.a 5-year; 10% coupon par value bond

c.a 5-year; zero-coupon bond

d.a 4-year; 10% coupon par value bond e.none of the above

Thanks a lot!