List and explain the three elements that require integration to be successful in operations and supply chain management? (4) b) Make use of a diagram to show and explain the concept of Operations and supply chain management. (7) c) Why is it that the critical zone begins at a utilization rate of about 70 percent in a typical service operation? Draw upon your own experiences as either a customer or a server in common service establishments. (4) d) As the field of OSCM has advanced, new concepts have been applied to help companies compete in several ways, including the advertisement of the firms products or services. One recent concept to gain the attention of companies is promoting sustainability. Discuss how you have seen the idea of sustainability used by companies to advertise their goods or services.