S&S pays all accounts within 10 days to take advantage of early-payment discounts. When it is time to pay a bill, the accounts payable clerk retrieves the vendor invoice, attaches the purchase order and the receiving report, and forwards the matched documents to Ashton Fleming. Ashton reviews the documents to ensure they are complete, prepares a two- part check, forwards all the documents to Susan, and records the check in the cash disbursements journal. Susan reviews the documents to ensure that they are valid payables and signs the checks. She forwards the check to the vendor and returns the documents and the check copy to the accounts payable clerk. The clerk files the documents alphabetically in a paid invoice file. At the end of every month, the accounts payable clerk uses the accounts payable ledger to prepare an accounts payable report that is forwarded to Susan. After she is finished with the report, Susan files it chronologically. Required a. Prepare a context diagram and a Level 0 DFD to document accounts payable processing at S&S. b. Prepare a document flowchart to document accounts payable processing at S&S c. Prepare a BPD to document accounts payable processing at S&S