3. In this case. AREI prints information from its data- base, which the real estate agent uses to help show the house to the buyer (a process beyond the scope of the system to be modeled). Other buyers seek. AREI's advice in finding a house that meets their needs. In this case, buyers complete a buyer infor- mation form. Information from it is entered into a buyer database, and AREI real estate agents use its information to search AREI's database and the mul- tiple listing service for houses that meet their needs. The results of these searches are printed and used to help the real estate agents show houses to the buyers. Draw a physical level 0 DFD for the following sys- tem and compare it with the logical model that you created in Chapter 5. A Video Store (AVS) runs a series of fairly standard video stores. Before a video can be put on the shelf, it must be cataloged and entered into the video database. To rent a video, every customer must have a valid AVS customer card. Customers rent videos for three days at a time. Every time a customer rents a video, the system must ensure that he or she does not have any overdue videos. If so, the overdue videos must be returned and the customer must pay a fine before renting more videos. Likewise, if the customer has returned over- due videos, but has not paid the fine, the fine must be paid before new videos can be rented. Every morning, the store manager prints a report that lists overdue videos; if a video is two or more days overdue, the manager calls the customer to remind him or her to return the video. If a video is returned in damaged condition, the manager removes it from the video database and sometimes charges the customer.