Maintaining EDGE Auditor status involves specific requirements to ensure ongoing competence. The EDGE Expert and Auditor Protocols outline these requirements: "To maintain their status, EDGE Auditors must perform at least one project site audit every two years, attend refresher training as required by IFC, and stay updated by studying the EDGE user guides and protocols as they are revised" (EDGE Expert and Auditor Protocols, Section 5.1: Maintaining Auditor Status). Option A (performing at least one project site audit every two years) is explicitly required to demonstrate active engagement. Option B (studying the EDGE user guides as updated) is also necessary to stay current with program changes. Option D (attending refresher training) is mandated to ensure continued education. However, Option C (retaking the auditor exam) is not a requirement for maintaining status: "Once certified, EDGE Auditors are not required to retake the exam to maintain their status, though they may need to retake it if their certification lapses or if significant program changes occur" (EDGE Expert and Auditor Protocols, Section 5.2: Recertification Conditions). Since the question focuses on maintaining status, not recertification after lapse, retaking the exam is not a standard requirement. Thus, retaking the auditor exam (Option C) does not contribute to maintaining Auditor status.