Which of the following control procedures would provide the greatest assurance that all donations to...

Use a lockbox to receive all donations.

Perform periodic internal audits of theorganization’scash receipts by tracing deposits to the original posting in the cash receipts records.

Require that all donations be made by cheque.

Require issuance of a confirmation receipt to all donors, with the receipt issued by the person who opens and deposits the cash receipts.