You must choose one of the following: a stock fund, a bond fund, or a portfolio of 50% stock and 50% bond. The expected returns are 13% and 8% for the stock and bond fund, respectively, and the standard deviations are 20% and 16%, with a correlation of 0.40 between the two funds. You can also borrow or lend at 5%. Relying on mean-variance analysis, determine the order of your preference from most preferred to least preferred.