The following auditors have nonprofit organization clients and perform their audits under the Yellow Book. They all perform nonaudit services for those clients. Which auditor has impaired his or her independence? O A. Jane provides nonaudit services prior to being engaged to perform the audit. B. Eric provides a nonaudit service that is not addressed in GAGAS requirements. O c. Darcy provides nonaudit services related to periods prior to the financial statement period. D. Ian audited the financial statements for the period in which he performed nonaudit services.