Final answer:
In PI Planning meetings, the Product Owner coordinates with other Product Owners, shared resources, and importantly with stakeholders such as business owners, users, customers who have an interest in the project.
Step-by-step explanation:
During the PI Planning meetings, the Product Owner coordinates not only with other Product Owners and shared resources but also with c) Stakeholders. These stakeholders include the business owners, users, customers, and anyone else who has an interest in the outcome of the project. In PI Planning, it is crucial for Product Owners to collaborate with these groups to ensure that the team's vision and objectives are aligned with the stakeholders' expectations and needs. Additionally, collaboration with stakeholders helps to identify dependencies and facilitate decision-making.