Which of the following statements is CORRECT? a. The constant dividend growth model can be used to value firms whose dividends are expected to decline at a constant rate. Ob. The price of a stock is the present value of all expected future dividends, discounted at the dividend growth rate. Oc. The constant growth model is well-suited for evaluating start-up companies. d. The constant growth model cannot be used for a zero growth stock, wherein the dividend is expected to remain constant over time