vich of the following is true conceming the capital structure weights that we use to calculate the waighted average st of capital? lect one: a. depend on the firms tax rate b. remain constant over time unless the firm issues new securities c. are based on the book values of total debt and total equity d. are computed using the book value of the long-term debt and the book value of equity e. are based on the market value of the firm's debt and equity securities