Which of the following are true? (A) Process costing assumes all units are homogeneous and follow the same path through the production process (B) The number of units in the beginning Work-in-Process Inventory plus the units transferred out during the period equals the number of units started during the period plus the number of units in the ending Work-in-Process Inventory Only A is true Only B is true Both A and B are true Neither Anor Bare true