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4. A three-year Treasury security currently earns 2.11 percent. Over the next three years, the real risk-free rate is expected to be 1.2 percent per year, and the inflation premium is expected to be 0.60 percent per year. What's the maturity risk premium on the three-year Treasury security?

A. 1.44 percent

B. 0.44 percent

C. 0.31 percent

D. 2.71 percent