Next, let$$s take a look at Bookster$$s ordering system. Based on the following description and Context Level DFD$,$ create a level $0$ dataflow diagram. This part of the exercise is worth $40\%$ of the marks.

When an order from a customer is received, the order is checked for completeness. If there is a problem with the order, the customer is notified. Otherwise, if the order is correct, Bookster ships the book to the customer, updates the inventory file and updates the billing file. At the end of each month, the system gathers the billing information for each customer and sends them an invoice.

Context Diagram

Level $0$ Diagram

Insert your level $0$ diagram here. Remember, this level is an expansion of the main process in the Context diagram into it$$s subprocesses. Use the same external entity $($Customer$).$ Include each sub$-$process $($named and numbered appropriately$),$ the two datastores, and all applicable dataflows $($remember$,$ dataflows are labelled as nouns, not verbs$).$ Use Miro, PowerPoint, or any other drawing software you prefer to create your diagram. Please ensure that you use the correct shapes$/$symbols$.$knskjdhjefmdbsjdgwdj