When comparing centralized to decentralized purchasing, which of the following is/are true? The coordination of all purchasing activities for the entire plant are performed through one central location as opposed to multiple locations. Lower costs are often achieved because of the availability of purchase quantity discounts. The supply manager is allowed more authority and credibility with centralized purchasing. all of theseAn effective purchasing framework includes which of the following decision areas? supply management, buying, supplier development, and manufacturing supply management, buying, supplier development, and marketing supply management, buying, quality control, and marketing marketing, buying, supplier development, and manufacturing