(Security market line) You are considering the construction of a portfolio comprised of equal investments in each of four different stocks. The betas for each stock are found below: Asset Beta A 2.10 B 0.90 0.40 D - 1.30 (Click on the icon in order to copy its contents into a spreadsheet.) a. What is the portfolio beta for your proposed investment portfolio? b. How would a 25 percent increase in the expected return on the market impact the expected return of your portfolio? c. How would a 25 percent decrease in the expected return on the market impact the expected return on each asset? C. a. The portfolio beta for your proposed investment portfolio is (Round to three decimal places.)