6. Which of the following statements about stock valuation is most correct? a. All dividends, including the one just paid (i.e., DO), must be included in the calculation of today's stock price. b. It is impossible to value a stock with a negative growth rate. c. The price of a share of stock of a company that currently pays no dividend must be zero. d. In the constant dividend growth model, the required rate of return is equal to the dividend yield minus the capital ga e. If a stock is expected to pay a constant dividend forever, then its price (when comparing a specific date one to the sar specific date in the following year) should never change, provided that the required rate of return stays the same