Which of the following are the three stages of optimizing an organization's sourcing assets? leveraging through volume discounts, focusing on the value proposition, and practice and high-quality feedback contract negotiations, leveraging through volume discounts, and post-implementation follow-up focusing on the value proposition, contract negotiations, and leveraging through volume discounts design stage, leveraging through volume discounts, and focusing on the value proposition______ is a strategic approach to planning and acquiring organizational needs through effectively managing suppliers. Procurement Asset management Supply management Total quality management