please answer the following questions

The rate of return on which type of security is normally used as the risk-free rate of return? Multiple Choice Long-term Treasury bonds Long-term corporate bonds Treasury bills Intermediate-term Treasury bonds Intermediate-term corporate bonds What range of returns should you expect to see with a 99 percent probability on an asset that has an average return of 11.03 percent and a standard deviation of 24.73 percent? Multiple Choice -38.43% to 60.49% -13.70% to 35.76% -13.70% to 8.36% 63.16% to 85.22% -26.07% to 48.13%