⟩ The behavioral approach of management thoughts can be classified into I. Bureaucratic management. II. Group influences. III. Hawthorne studies. IV. Contingency theory. a) Both (I) and (II) above b) Both (I) and (III) above c) Both (II) and (III) above d) (I), (II) and (III) above e) (II), (III) and (IV) above.