Which of the following statements is correct? a. diversifiable risk can be reduced by forming a large portfolio, but normally even highly-diversified portfolios are subject to market (or systematic) risk. b. a large portfolio of randomly selected stocks will always have a standard deviation of returns that is less than the standard deviation of a portfolio with fewer stocks, regardless of how the stocks in the smaller portfolio are selected. c. a large portfolio of stocks whose betas are greater than 1.0 will have less market risk than a single stock with a beta = 0.8. d. a large portfolio of randomly selected stocks will have a standard deviation of returns that is greater than the standard deviation of a 1-stock portfolio if that one stock has a beta less than 1.0. e. if you add enough randomly selected stocks to a portfolio, you can completely eliminate all of the market risk from the portfolio.