suppose the spot rates for government bond with maturities of one, two and three years are given by s1=5%, s2=7% and s3=8%. what can you infer about the yield to manturity of a three year pure discount bond issued by the government. Explain why?

a)6.659%

b)6.667%

c)8%

d) given the information, one cannot infer anything about the yield to maturity