a. In a portfolio of two stocks, the riskiness of the portfolio: honom (6) velos Is the same as the simple average of the two firm's risks Sb. Is the same as the weighted average of the two firm's risks Can be zero if the two firm's correlation coefficient is -1 d. Can be zero if the two firm's correlation coefficient is 0 Can never be zero, but may be lower than each of the firm's riskiness depending on the correlation of the two firm's returns c. e