Final answer:
The PO sync should be attended by both the Scrum Master and the Product Owner, to align on priorities and discuss the product backlog.
Step-by-step explanation:
The Product Owner (PO) sync is typically a meeting relevant to the Agile and Scrum methodologies within project management. The attendees of the PO sync should ideally include both the Scrum Master and the Product Owner. This meeting is an opportunity for these two roles to align on the product backlog, priorities, and to discuss any impediments that may require the Scrum Master's assistance for removal. It is a strategic meeting focusing on the effectiveness of the development process from the perspective of backlog management and delivering value to the customer.