According to the constant dividend growth model (or Gordon model), which of the following statement is incorrect? a) Assume that the required rate of return on a given stock is 13 percent. If the stock's dividend is growing at a constant rate of 5 percent, its expected dividend yield is 8 percent. b) A stock's expected dividend yield must equal the expected growth rate. c) The expected dividend yield on a stock is equal to the required rate of return less the expected capital gains yield. d) A stock's expected capital gains yield can be greater than the expected dividend yield