A targeted approach is used when internal audit performs a specific engagement focused directly on organizational culture, including culture-related processes, controls, risks, and indicators. This differs from an integrated approach, where culture considerations are embedded into multiple audits across the audit plan. A top-down approach would begin with senior leadership, governance, tone at the top, and strategic cultural expectations. A blended approach would combine direct culture audits with culture assessment within other engagements. In this question, the CAE scheduled an assurance engagement specifically on key processes and controls related to organizational culture, making it a focused or targeted engagement. Therefore, Option C is correct.