Answer:
The correct statements under the step-down method are:
a. I, II, and III.
Step-by-step explanation:
The step-down method of allocating the costs of service departments is one of the three methods in use. The others include the direct method and the reciprocal method. With the direct method, service departments' costs are directly allocated to the production departments without any allocation to a service department. The reciprocal method is much more involved, using formulas and calculations. The step-down method allocates the service departments' costs to all the other service and production departments, except itself. This step is eventually followed until all the service departments' costs have been allocated to the production departments.