Regarding control charts, changing from two - sigma limits to three - sigma limits: O A. decreases the probability that the process average will change. O B. decreases the probability that defects will be generated by the process. O C. increases the probability of concluding nothing has changed, when in fact it has. OD. increases the probability of searching for a cause when none exists. The investment a company makes in training employees to perform their duties and redesigning products and processes to improve them would be categorized as prevention costs O True O False