Which of the following choices best describes the role of taxes on the after-tax cost of capital in the U.S. from the different capital sources? a.Common equity: no effect; preferred equity: decrease; debt: decrease b.Common equity: decrease; preferred equity: decrease; debt: no effect c.Common equity: no effect; preferred equity: no effect; debt: decrease d.Common equity: decrease; preferred equity: decrease; debt: decrease e. Common equity: decrease; preferred equity: decrease; debt: decrease