The primary purpose of PO Sync is to assess progress of the Program Increment (PI) and adjust scope and priority as needed12. PO Sync is a regular event that involves the Product Owners from all the Agile teams in an Agile Release Train (ART)12. In PO Sync, they share the status of their work, identify dependencies, risks, and impediments, and align on the product vision and roadmap12. PO Sync helps to ensure that the ART delivers value to the customers and meets the PI objectives12.
Some additional information that might be helpful for you are:
*The other options (B, C, and D) are not the primary purpose of PO Sync, but rather purposes of other events or activities.
*Building PI Objectives and improving alignment is the purpose of PI Planning, which is a two-day event that occurs at the beginning of each PI3. In PI Planning, all the members of the ART collaborate to define, prioritize, and plan the work for the next PI3.
*Aligning with Coach Sync participants on the status of the PI is the purpose of Scrum of Scrums (SoS), which is a regular event that involves the Scrum Masters from all the Agile teams in an ART4. In SoS, they coordinate and synchronize the work of the teams, resolve cross-team impediments, and report the progress and risks to the RTE4.
*Conducting backlog refinement is an activity that occurs throughout the PI, where the Product Owner and the Development team review and update the Team Backlog to prepare for the upcoming Iterations. Backlog refinement helps to ensure that the work items are clear, feasible, and valuable