28. Which of the following statements is NOT correct? a. In the real world, it is relatively easy to determine the optimal capital structure for a company since the tax benefit could be easily estimated by formula. b. Financial distress costs include not only direct costs, such as legal and administrative costs of liquidation, but also indirect costs such as agency costs. c. Financial distress may incur agency problem such as the conflict of interest between shareholders and bondholders. This could lower the firm value. d. The agency problem between shareholders and bondholders could be solved by using protective covenants. e. None of the above choices