Gardner Electric has a beta of $0\mathrm{.}88$ and an expected dividend growth rate of $4\mathrm{.}00\%$ per year. The T$-$bond rate is $5\mathrm{.}25\%.$ The annual return on the stock market during the past $4$ years was $10\mathrm{.}25\%.$ Investors expect the average annual future return on the market to be $13\mathrm{.}75\%.$ Using the SML$,$ what is the firm's required rate of return? Select the correct answer. a$.11\mathrm{.}23\%$ b$.11\mathrm{.}73\%$ c$.12\mathrm{.}23\%$ d$.13\mathrm{.}23\%$ e$.12\mathrm{.}73\%$