The following graph plots portfolio risk against the size of the portfolio as measured by the number of stocks in the portfolio. Based on the data presented on the previous graph, which of the following statements are true? Check all that apply. As the portfolio size increases, its market risk remains constant. A portfolio of 80 stocks has a diversifiable risk of 42%. Adding risky stocks increases the risk of the portfolio. Diversifiable risk lies above a = 30%. As the portfolio size increases, its total risk declines. The benchmark fora well-diversified stock portfolio is the market portfolio, which is a portfolio containing all stocks. The relevant risk of an individual stock is measured by its beta coefficient, which is defined under the Capital Asset Pricing Model (CAPM) as the amount of risk that the stock contributes to the well-diversified portfolio. Based on your understanding of the CAPM and beta, answer the following question: Which of the following is the correct definition of beta coefficient of stock i, b1? The Standard Deviation of Stock i's Return x The Correlation Between stock i's Return and the Market Return (The Standard Deviation of Stock i's Return / The Standard Deviation of the Market Return) x The Correlation Between stock i's Return and the Market Return i The Standard Deviation of Stock i's Return / The Standard Deviation of the Market Return