Suppose Marys stock has a standard deviation of 45%, while Harry stock has a standard deviation of 35%. If the correlation between these stocks is 0.1, what is the standard deviation of a portfolio consisting of 45% Mary and 55% Harry stock?

a. The standard deviation of the portfolio is 54.50%.

b. The standard deviation of the portfolio is 30.82%.

c. The standard deviation of the portfolio is 9.50%.

d. The standard deviation of the portfolio is 29.30%.