Final answer:
Resolving differences reported by customers on confirmation requests necessitates human interaction and cannot be performed through a computer program. Tracing receipts, selecting accounts for confirmation, and examining invoices can all be done with audit software.Answer is option a
Step-by-step explanation:
The task of resolving differences reported by customers on confirmation requests could not be efficiently performed by a computer program. This process involves communication with customers, understanding their concerns and discrepancies, and applying professional judgment to evaluate the information provided. This is inherently a manual task that relies heavily on human interaction and judgment.
Other tasks listed such as tracing audited cash receipts to accounts receivable credits, selecting accounts to be confirmed on a random basis, and examining sales invoices for completeness and consistency can be performed through a computer program designed for these specific audit procedures.