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| An internal auditor noted that several shipments were not billed. To prevent recurrence of such nonbilling, the organization should A. Numerically sequence and independently account for all controlling documents (such as packing slips and shipping orders) when sales journal entries are recorded. B. Undertake a validity check with customers as to orders placed. C. Release product for shipment only on the basis of credit approval by the credit manager or other authorized person. D. Undertake periodic tests of gross margin rates by product line and obtain explanations of significant departures from planned rates. |