Luther Inc., has 4,000 shares of 5%, $50 par value, cumulative preferred stock and 100,000 shares of $1 par value common stock outstanding at December 31, 2020, and December 31, 2019. The board of directors declared and paid an $8,000 dividend in 2019. In 2020, $40,000 of dividends are declared and paid. What are the dividends received by the common stockholders in 2020? Select one: O a $30,000 b. $28,000 c. None of the choices given d. $20,000 e. $40,000