Prepare a context diagram and a Level 0 DFD for each of the following situations.

a. Prepare and file a tax return with the tax owed to the Internal Revenue Service.

b. A customer pays an invoice with a check. Accounts receivable is updated to reflect the payment. The check is recorded and deposited into the bank.

c. A customer places an online order to purchase merchandise. The order is approved, filled, and sent to the customer with an invoice.

d. An inventory request is received by the purchasing department. The purchasing department prepares and sends a purchase order to the appropriate vendor.

e. A vendor invoice is received, reviewed, and compared against the appropriate purchase order, then paid and filed.

f. A bill of lading for ordered inventory is received from a vendor, recorded, checked against the appropriate purchase order, and filed.