Which of the following factors, considered in isolation, would reasonably be assumed to contribute to a firm's Weighted Average Cost of Capital (W.A.C.C.) being higher than it otherwise would be? (Choose all that apply.) a worsening credit rating on its debt a lower Beta on its stock increased use of debt in the capital structure (from low to moderate levels), relative to other sources of funding increased use of common stock in the capital structure, relative to other sources of funding higher interest rates in the overall economy an increasing MRP estimate a shift in project selection to less risky projects overall