As a business owner of a mid-sized retail company, consider disparate data sets where tables of sales data exists for multiple products (top adapters, binoculars, cameras, and filters) from multiple locations in different city, state and country. Your business has collected these tables of data from different OLTP sources each week over three years. a. What method is used to retrieve these disparate sources of information? Briefly note each step b. Give a specific example of a type of model to use in order to hold this information together in your data warehouse? c. Give an example of each of the following operations. In each case, what is the result of the operation before the operation and afterward (e.g. "a table displaying sales for product A by year"). i. Drill-Down ii. Slice iii. Pivot