The Omega Corporation has some excess cash it would like to invest in marketable securities for a long-term hold. Its vice-president of finance is considering three investments (Omega Corporation is in a 35 percent tax bracket and the tax rate on dividends is 20 percent). Which one should she select based on after-tax return:

(a) Treasury bonds at a 10 percent yield;

(b) Corporate bonds at a 13 percent yield;

(c) Preferred stock at an 11 percent yield?