A 10-year bond has a coupon rate of 7% annually and a principal payment of $1,000.0. Other similar bonds are paying 9% annually. To determine the value of the bond you must find the interest factors, IF. at:

A. 9% for 10 periods
B. 9% for 20 periods
C. 4.5% for 20 periods
D. 4.5% for 10 periods