Based on the Markowitz (Modern) Portfolio Theory, is it beneficial to add Risk Free security to your portfolio of risky assets?

Group of answer choices

No, it will lower your expected return

No, it will lower the return per unit of risk taken

Yes, it allows you to tailor the amount of risk you take and still receive the best achievable risk vs. return tradeoff for a given set of stocks

Yes, if you have short term investment horizon