I need help creating a context data flow diagram

Pine Valley Furniture As a Pine Valley Furniture intern, you have gained valuable insights into the systems development process. Jim Woo has made it a point to discuss with you both the WebStore and the Customer Tracking System projects. The data requirements for both projects have been collected and are ready to be organized into data-flow diagrams. Jim has prepared the data-flow diagrams for the WebStore; however, he has requested your help in preparing the data-flow diagrams for the Customer Tracking System. You recall that Pine Valley Furniture distributes its products to retail stores, sells directly to customers, and is in the process of developing its WebStore, which will support online sales in the areas of corporate furniture buying, home-office furniture purchasing, and student furniture purchasing. You also know that the Customer Tracking System's primary objective is to track and forecast customer buying patterns. Information collected during the requirements determination activity suggests that the Customer Tracking System should collect customer purchasing activity data. Customers will be tracked based on a variety of factors, including customer type, geographic location, type of sale, and promotional item purchases. The Customer Tracking System should support trend analysis, facilitate sales information reporting, enable managers to generate ad hoc queries, and interface with the WebStore. a. Construct a context data-flow diagram, illustrating the Customer Tracking System's scope