Overlapping, a tactic for smoothing the load and minimizing the impact of changed lead time, O A. sends the lot to two different machines for the same operation. O B. involves breaking up the order and running part of it earlier (or later) in the schedule. OC. sends pieces to the second operation before the entire lot is completed on the first operation. OD. overlaps newer equipment and older equipment. Frequent changes in an MRP system are known as O A. pegging. OB. time fences. O C. system nervousness. OD. system anxiety