Which of the following statements is correct? Select one: a. Although some methods of estimating the cost of capital encounter severe difficulties, the CAPM is a simple and reliable model that provides great accuracy and consistency in estimating the cost of capital. b. The DCF model is preferred over other models to estimate the cost of equity because of the ease with which a firm's growth rate is obtained. c. The bond-yield-plus-risk-premium approach to estimating the cost of equity is not always accurate but its advantages are that it is a standardized and objective model. d. The tax savings associated with depreciation are an additional source of capital and, in fact, represent the largest single source of funds for some firms. e. None of the above is a correct statement