5-year Treasury bonds yield 6.4%. The inflation premium (IP) is 1.9%, and the maturity risk premium (MRP) on 5-year T-bonds is 0.4%. There is no liquidity premium on these bonds. What is the real risk-free rate, r*?
a. 3.90%
b. 3.77%
c. 5.04%
d. 5.13%
e. 4.10%