(a) Prerequisites to a Class Action. One or more members of a class may sue or be sued as representative parties on behalf of all if:
(1) The class is so numerous that joinder of all members, whether otherwise required or permitted, is impracticable;
(2) There are questions of law or fact common to the class which predominate over any questions affecting only individual members;
(3) The claims or defenses of the representative parties are typical of the claims or defenses of the class;
(4) The representative parties will fairly and adequately protect the interests of the class;
(5) A class action is superior to other available methods for the fair and efficient adjudication of the controversy; and
(6) The attorney