Case Study: A large retailer is interested in developing a system that will enable it to forecast its customers' orders based on previous orders and items that have run out at various times during the year. For example, during the months of Ramadan last year, there was a huge demand for fruits and nuts. This system is sensitive because it offers the supermarket an edge over its rivals, so they don't want to ask help from another company for fear of the information being leaked to their competitors. As a result, they've opted to invest in their own IT department, recruiting skilled IT personnel to handle it themselves. Question: Based on the above case, what type of information system sourcing did the company use in this case? explain why in less than 5 lines? (20 Points)