Gardner Electric has a beta of 0.88 and an expected dividend growth rate of 4.00% per year. The T-bill rate is 4.00%, and the T-bond rate is 5.25%. The annual return on the stock market during the past 4 years was 10.25%. Investors expect the average annual future return on the market to be 11.75%. Using the SML, what is the firm's required rate of return? Select the correct answer. O a. 13.43% O b. 13.5396 O c. 13.58% O d. 13.63% e. 13.4896