Which of the following is not a true statement? a. Companies that are believed to have high bankruptcy risk generally receive low credit ratings and must pay a higher interest rate for borrowing. b. As a company's level of debt increases, the risk of bankruptcy increases. c. Interest expense incurred when borrowing money, as well as dividends paid to stockholders, are both tax-deductible. d. The mixture of liabilities and stockholders' equity a business uses is called its capital structure.