Choice "A" is correct. Generally accepted government auditing standards (GAGAS) prescribe additional standards on the direct reporting of illegal acts. For example, the auditor is required to directly report illegal acts discovered during the audit to federal inspector generals if management fails to disclose such illegal acts to the grantor or fails to take appropriate remedial action. In addition, GAGAS also prescribe additional standards related to internal control reporting, such as requiring that the auditor provide a written report on internal control in every financial statement audit and specific reporting over internal control over compliance.
Choices "b", "d", and "c" are incorrect, based on the above explanation.