Which of the following statements about dividends is true?

a. Dividends received are always added to taxable income of investors.

b. Dividends are the only source of return that investors earn on common stock investments.

c. The payment of dividends is at the discretion of the board of directors.

d. The payment of dividends by the corporation is a tax-deductible business expense.

e. A corporation can be sued for not paying undeclared common stock dividends.