Companies can issue different classes of common stock. Which of the following statements concerning stock classes is CORRECT?

a. All common stock, regardless of class, must pay the same dividend.

b. All firms have several classes of common stock.

c. All common stocks fall into one of three classes: A, B, and C.

d. Some class or classes of common stock are entitled to more votes per share than other classes.

e. All common stocks, regardless of class, must have the same voting rights.