Discuss the difference between preventive controls and detective controls. Assume that you are an auditor for a manufacturing company that buys extensive amounts of raw materials. Your company wants to avoid fraudulent activity from occurring in the Purchasing Division. There are eight purchasing agents in that division who buy raw materials from approximately 40 different vendors. About $500 million of purchases are made annually from those vendors. Give two examples each of preventive and detective controls that you would recommend for the Purchasing Division