Transforming a PMO into an agility-driven entity requires embracing agile principles of flexibility, responsiveness, and customer collaboration. PMI-PMOCP emphasizes collaborating with customers to develop and prioritize a product backlog as a foundational agile practice. This backlog reflects customer needs, enabling the PMO to deliver incremental value and adapt priorities dynamically. While establishing idea collection (option B), adopting Scrum (option C), and improving communication tools (option D) support agility, the product backlog represents the central mechanism for agile planning and delivery. It aligns the PMO's work with stakeholder priorities and fosters iterative improvement. Reference:PMI Project Management Office Certified Professional (PMI-PMOCP) Examination Content Outline, PMI 2021.PMI-PMOCP Study Guide, Chapter on Agile Practices in the PMO.