Final answer:
Alternative procedures for confirmations that are not returned by the customer are required in auditing. Examining subsequent cash receipts is not considered an alternative procedure.
Step-by-step explanation:
When positive confirmations are used in the auditing process, alternative procedures are required for confirmations that are not returned by the customer. This ensures that the auditor has sufficient evidence to support their findings. In the given options, examining subsequent cash receipts to determine if the receivable has been paid would not be considered an alternative procedure. This is because it does not provide direct evidence of whether the customer received and acknowledged the confirmation request.