Which of the following factors should an auditor consider most important upon subsequent discovery of facts that existed at the date of the audit report and would have affected the report?

a. The clients willingness to issues revised financial statements or other disclosures to persons known to be relying on the financial statement

b. The clients willingness to pay additional fees for the additional procedures to be performed

c. The cost-to-benefit ratio of performing additional procedures to better determine the impact of the newly discovered facts

d.The potential impact on financial statements and associated audit reports for the previous 5 years.