*Please explain your answer clearly.

Paolo holds a $5,000 portfolio that consists of four stocks. His investment in each stock, as well as each stock's beta, is listed in the following table: Suppose all stocks in Paolo's portfolio were equally weighted. The stock that would contribute the least systematic risk to the portfolio is . Further, if all of the stocks in the portfolio were equally weighted, the stock that would have the least amount of unsystematic risk is If the risk-free rate is 4.00% and the market risk premium is 6.50%, then Paolo's portfolio will exhibit a beta of and a required return of