Which of the following is correct about supply chain management? 1- The purposes of the supply chain management are to create value, enhance efficiency, and satisfy customers. 2- is the management, across and within a network of upstream and downstream organizations, of both relationships and flows of material, information, and resources 3- has enabled many countries to offshore to lower-cost economies for not only their manufacturing capabilities but also entire service activities such as product maintenance and customer service. 4- 1&2