Arbor Systems and Gencore stocks both have a volatility of 31%. Compute the volatility of a portfolio with 50% invested in each stock if the correlation between the stocks is (a) +1.00, (b) 0.50, (c) 0.00, (d) -0.50, and (e)-1.00. In which of the cases is the volatility lower than that of the original stocks? If the correlation is +1.00, the volatility of the portfolio is%. (Round to one decimal place.) If the correlation is 0.50, the volatility of the portfolio is%. (Round to one decimal place.) If the correlation is 0.00, the volatility of the portfolio is%. (Round to one decimal place.) If the correlation is -0.50, the volatility of the portfolio is%. (Round to one decimal place.) If the correlation is -1.00, the volatility of the portfolio is%. (Round to one decimal place.) In which of the cases is the volatility lower than that of the original stocks? (Select the best choice below.) OA. In none of the cases. OB. In all of the cases. OC. In cases (d) and (e). OD. In cases (b), (c), (d) and (e)