OSCM Ch 17,18,and 19

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in short paragraph answer each these qustions
1-What are the benefits associated with maintaining control and visibility of transportation shipments? (100 words max)
2- How can Purchasing make use of social networking software/portals like facebook and linkedin to improve their daily job performances? (100 words max)3- What is performance benchmarking? Why is it increasingly being used when establishing purchasing performance goals and objectives? (100 words max)