A portfolio is composed of two stocks, A and B. Stock A has a standard deviation of return of 25% while stock B has a standard deviation of return of 5%. Stock A comprises 20% of the portfolio while stock B comprises 80% of the portfolio. If the variance of return on the portfolio is 50%2 , the correlation coefficient between the returns on A and B is 1) - 225 2) -.474 3).474 4).225