Which of the following statements is true? a. the gordon growth model assumes constant dividend growth but implies that stock prices grow at a different rate. b. a stock's price is the present value of its future cash flows, namely, its expected capital gains and dividends. c. brokers buy and sell securities from their own inventory, while dealers bring buyers and sellers together to complete transactions. d. holders of common stock have greater voting rights in corporate decisions than holders of preferred stock, but they have less voting rights than creditors of the corporation.