Question.1 Construct a data flow diagram for process 4.5 by using the following information FUNCTION 4.5- "APPROVE BUYER ITEM COLLECTION" The aim of this function is to ensure that a Buyer can only collect the items purchased at an exhibition if the invoice(s) specifying those items are paid in full. When a Buyer arrives with an item collection request, we first have to ensure that he / she exists in our system. If they do not, we reject the request and send them to the Gallery Manager. We also check that the exhibition that they have purchased the items from does exist, and that the exhibition has in fact ended. If not, the request is rejected. If we do have an existing buyer and a valid exhibition, we select all the Buyer's invoices for the nominated exhibition. If there are no invoices, the collection request is rejected. A check is then made on each selected invoice to ensure that it is paid in full. This check is done by looking at the payment number on the invoice record. If the payment number is present then collection for the invoice is approved. If payment has not been made then the collection is not approved. If item collection is approved, then a collection request is created, formatted, printed and given to the buyer. They use this receipt to collect their items. The invoice record is also updated to show that the items have been collected. If item collection is rejected, then an invoice reminder is created, formatted, printed and given to the buyer as a reminder notice. A collection request or invoice reminder is printed for each Buyer invoice for the nominated exhibition