Consider the following statements about the step-down method of service department cost allocation: I. Under the step-down method, all service department costs are eventually allocated to production departments. II. The order in which service department costs are allocated is important. III. After a service department's costs have been allocated to other departments, no costs are re-circulated back to that service department. Which of the above statements is (are) correct? Select one: a. I, II, and III. b. I only. c. I and II. d. II only. e. I and III.