Consider this plot, where each blue point is a possible portfolio of stocks. The return and the risk are calculated at monthly frequency. What is the rate on the one month T-bill? 0.8% 2.5% 45% Consider this plot, where each blue point is a possible portfolio of stocks. The return and the risk are calculated at monthly frequency. What is the rate on the one month T-bill? 0.8% 2.5% 45%