The HRZ Company maintains a perpetual inventory system. Clerks in the accounting department post the data manually from two source documents- receiving reports and shipping notices. The receiving reports and shipping notices are filed by posting date. The inventory records are analyzed after each posting to determine if the items should be reordered. If an item needs to be reordered, a purchase requisition (one copy) is prepared and sent to the purchasing department. There, clerks select a vendor from a master vendor file, prepare a purchase order (four copies), and update the vendor file to reflect the order. The purchase order is approved by the Purchasing Manager and distributed as follows: original copy to the vendor; Copy 2 is filed numerically with the corresponding purchase requisition attached; Copy 3 is forwarded to the receiving department; Copy 4 is sent to the accounting department.

a) Prepare a Business Process Modeling and Notation diagram.

b) Prepare a Data Flow Diagram (level 0) of the proceding procedure.

c) Prepare a document flowchart of the proceding procedures. (Using Word is recommended).