2. Which of the following statements is correct? Give a brief but precise explanation. (a) Proper diversification can always eliminate systematic risk. (b) Proper diversification cannot always eliminate but can always at least reduce systematic risk. (c) The risk-reducing benefits of diversification do not occur until at least 15-20 in- dividual securities have been purchased. (d) Because diversification reduces a portfolio's total risk, it necessarily reduces the portfolio's expected return