You own a portfolio which is invested equally in two stocks and a risk-free security. Beta is 89 for Stock. A and 1.26 for Stock B. Which one of th. following will increase the portfolio beta, all else being constant? increasing the amount invested in the risk-free security decreasing the weight of Stock B and increasing the weight of Stock A replacing Stock A with a security that has a beta of 77 incteosing the weight of Stock A and decreasing the weight of the risk-free security replacing Stock E with Stock C, which has a beta equal to that of the market