Case A: Fred's Electrical, Inc. sells electrical parts to electrical contractors in the northwestern US. Fred's customers mail their payments- attached to the stub (i.e. remittance advice) from their monthly statement-to Fred's accounts receivable office. An AR clerk confirms that the check amount agrees with the amount on the RA abatch totals of the customer numbers, invoicend sends the checks to the cashier. The AR clerk prepares batch totals of the customer numbers, invoice numbs, and amount paid. The AR clerk then enters the batch totals and RAs into the computer, where the AR master data is updated to record the payment. The computer reconcs the batch totals, confirms job completion, and reports discrepancies, if any to the AR clerk. Draw a physical data flow diagram