Suppose we observe the 3-year Treasury security rate (1R3) to be 8 percent, the expected 1-year rate next yearE(2r1)to be 4 percent, and the expected one-year rate the following yearE(3r1)to be 6 percent. If the unbiased expectations theory of the term structure of interest rates holds, what is the 1-year Treasury security rate, 1R1