Thecommunications management planis the primary source that identifies stakeholders, their information needs, and communication strategies. PMI-PMOCP emphasizes the importance of using this plan to understand who stakeholders are, how to engage them, and tailor communication accordingly.
Job descriptions (option B) or business documentation (option C) may provide limited stakeholder insight but lack engagement and communication context. Management approaches (option D) describe strategies but are not primary identification sources.
Reference:PMI Project Management Office Certified Professional (PMI-PMOCP)Examination Content Outline, PMI 2021.PMI-PMOCP Study Guide, Chapter on Stakeholder Management and Communication.