Granville Co. recently purchased several shares of Kalvaria Electronics' preferred stock. The preferred stock has a before-tax yield of 7.10%. If the company's tax rate is 25%, what is Granville Co.'s after-tax yield on the preferred stock? Assume a 50% dividend exclusion for tax on dividends. (Round your final answer to two decimal places.) O a. 6.21% b. 3.55% c5.32% d.4.44% e. 1.78%