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: 1R1=4.20%, E(2r1) =5.20%, E(3r1) =5.70%, E(4r1)=6.05% Using the unbiased expectations theory, what is the current (long-term) rate for four-year-maturity Treasury securities? 5.2875% 1.4790% 6.0500% 5.2852%.