The information regarding a portfolio consisting of two stocks is given below. Stock X Stock Z E(R) 1590 17% Standard Deviation 10% 1290 The correlation coefficient between Stocks X and Z is -1.00 It isto have the value of the portfolio standard deviation to be zero because Select one: o a. not possible; the rates of return of these two stocks are not perfectly negatively correlated. b. not possible; the weight of each stock in the portfolio is unknown. C. possible; the rates of return of these two stocks are perfectly positively correlated. d. possible; the rates of return of these two stocks are perfectly negatively correlated. O