Which of the following is the DuPont formula for return on stockholders' equity?

a.Return on stockholders' equity = (Operating Income Sales) (Average Total Assets Average Stockholders' Equity)

b.Return on stockholders' equity = Profit margin (Average Stockholders' Equity Average Total Assets)

c.Return on stockholders' equity = Operating Income Average Stockholders' Equity

d.Return on stockholders' equity = Common Stock + Preferred Stock + Additional Paid-in-Capital Treasury Stock