Brussel Company uses a process-costing system for its single product. Material A is added at the beginning of the process, while material B is added when the units are 50% complete. Brussel's ending work-in-process inventory consists of 4,000 units that are 75% complete. Which of the following correctly expresses the equivalent units of production with respect to materials A and B in the ending work-in-process inventory? Multiple Choice Material A: 3,000. Material B: 0 . Material A: 3,000. Material B: 3,000. Material A: 4,000 . Material B: 0 . Material A: 4,000. Material B: 4,000. Material A: 4,000. Material B: 3,000