What is the right formula to calculate the processing rate of a step in a batch process? Assume that the batch size is A units, the fixed setup time is B minutes, and the processing time per unit is C minutes per unit. Group of answer choices a. Processing rate = A/(B+C) b. Processing rate = A/(B+A*C) c. Processing rate = B+ A*C d. Processing rate = (B+A*C)/A