Which of the following statements is most accurate regarding sufficient and appropriate documentation?

Audit documentation is the property of the client, and sufficient and appropriate copies should be retained by the auditor for at least 5 years.

Sufficient and appropriate documentation should include evidence that it has been reviewed.

Accounting estimates are not considered sufficient and appropriate documentation.

If additional evidence is required to document significant findings or issues, the original evidence is not considered sufficient and appropriate and therefore should be deleted from the working papers.