When a vendor invoice is received, the invoice must be matched with the purchase order and receiving report before payment. Each of these documents is stored in a separate alphabetical file. The purchase orders are sent to accounts payable from the purchasing department. The receiving reports are forwarded to accounts payable from the receiving warehouse. When the invoice is received the A/P Clerk pulls the related PO and receiving report and matches the documents. The document packet is forwarded to the A/P supervisor who prepares a two-part check and forwards the packet along with the check to the Controller. The Controller reviews the documents to ensure that they are valid and signs the check. The Controller then mails the check to the vendor and returns the document package to the A/P Clerk, who files the canceled packet. Instructions: 1. Prepare a context level AND a level O data flow diagram. 2. Identify which diagram is the context level diagram and which is the level o diagram Tips: 1. Identify the entities involved (both sources and destinations). 2. Identify the data movement or flows. 3. What transformative processes are taking place? 4. How many data stores are required? 5. Label all the DFD elements appropriately