Final answer:
The positive confirmation form should be used when controls related to receivables are satisfactory and the negative confirmation form should be used when controls related to receivables are unsatisfactory. Option 4 is correct.
Step-by-step explanation:
The correct statement regarding the auditor's use of confirmations is option 4: The positive confirmation form should be used when controls related to receivables are satisfactory and the negative confirmation form should be used when controls related to receivables are unsatisfactory.
Positive confirmation requests are used when the auditor wants the recipient to respond directly (either by confirming or disputing) the accuracy of the information provided. This form is typically used when the auditor believes the controls related to the accounts receivable system are reliable.
Negative confirmation requests, on the other hand, ask the recipient to respond only if they disagree with the information provided. This form is generally used when the auditor believes that the controls related to the accounts receivable system are weak.