A Ramallah pharmaceutical company has the following situation involving the processing of purchases transaction, were the outside entities are suppliers (who receive purchase orders and ship ordered goods with packing slip), the inventory control department (which prepares requisition related to the needed goods), the store room which accepts received goods from the receiving department together with receiving reports), and the cash disbursements department (which receives approved suppliers invoices, together with supporting purchase orders and receiving reports), and management (which receives purchase analysis reports from purchasing) Required: A) Draw a context diagram (data flow diagram) for the situation B) Prepare in good form level zero data flow diagram that articulates with links to context diagram in A the sub processes a. Preparing the requisitions for needed goods b. Place order for goods c. Receive and count goods d. Place goods in store room e. Record invoice and approve for payment f. Prepare the report The needed data storage include supplier's data, open purchase orders data, and receiving reports data