Assume the current interest rate on a 1-year Treasury bond (1R1) is 6.50 percent, the current rate on a 2 year treasury bond (1R2) is 7.25 percent and the current rate on a 3 year treasury bond (1R3) is 8.50 percent, and the current 4- years teasury bond (1R4) is 10.5 percentage. If the unbiased expectations theory of the term structure of interest rates is correct, what is the 1 year foward rate expected on treasury bills during year 4, 4f1)?

a) 11.04

b) 12.66

c) 16.72

d)15.02