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

a. Collect time and attendance reports from different departments to calculate weekly wages. This data is validated before payroll is prepared.
b. A customer order is approved and filled. The inventory data is then updated.
c. A customer cancels her mail order. The cancellation is processed and a confirmation is sent to the customer.
d. A customer makes a partial payment on her outstanding balance with a check and submits remittance advice. Accounts receivable is updated to reflect the customer credit balance, and the remittance advice is filed manually.
e. A vendor invoice is received and subsequently paid. Accounts payable is then updated and the report is submitted for review to the management.
f. Pay the value-added tax (VAT) collected on sales made in the past month to the revenue service using the e-filing option on their website.