Answer (C) is correct . Canceling vouchers and supporting papers (with perforations, ink, etc.) upon payment prevents the payment of a duplicate voucher. If the person signing the check does the canceling, the documents cannot be recycled for duplicate payments. Securing the paid-voucher file from access by the accounts payable clerk is another effective control.
Answer (A) is incorrect because A single endorsement is not a control weakness if the person who signs does not have incompatible functions and if proper documentation is required before signing. Answer (B) is incorrect because The vouchers should not be canceled before payment. Answer (D) is incorrect because Mailing payments directly to payees does not prevent a second use of invoices by unethical personnel. Also, record keepers should not have access to signed checks.
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