Which of the following statements is true concerning the capital structure weights used in computing the weighted average cost of capital?

They are based on the book values of total debt and total equity.

They are based on the market value of the firm's debt and equity securities.

They are computed using the book value of the long-term debt and the book value of equity.

They remain constant over time unless the firm issues new securities.

They are restricted to the firm's debt and common stock.