Which of the following statements is correct with regard to process costing? A. Nonuniform input occurs when production costs are added at different points in time in a production department. B. The percentage of completion for all units in a subsequent department with respect to transferred in costs from a previous department is 100%. O C. Manufacturers who operate in a mass production environment choose between actual and normal costing to account for manufacturing overhead. OD. In sequential processing, manufacturing occurs "in order" of production departments. E. All of the above statements are correct