Unbiased Expectations Theory Suppose that the current one-year rate (one-year spot rate) and expected one-year T-bill rates over the following three years (i.e., years 2, 3, and 4, respectively) are as follows: 1_R_1=4.85%, E(2_r_1) =5.85%, E(3_r_1) =6.35%, E_4(r_1)=6.70% Using the unbiased expectations theory, what is the current (long-term) rate for four-year-maturity Treasury securities? 6.7000% 1.6340% 5.9375% 5.9352%