This answer states that business users, project manager, and key stakeholders are the people who should participate in UAT for an Experience Cloud implementation. UAT is a phase of testing where the BA verifies that the solution meets the requirements and expectations of the end users or customers. Business users are the people who will use or benefit from the solution on a regular basis, and who can provide feedback on its functionality, usability, and value. Project manager is the person who oversees and coordinates the project activities, resources, and deliverables, and who can ensure that UAT is conducted according to the project plan and scope. Key stakeholders are the people who have a significant interest or influence in the project outcome, and who can approve or reject the solution based on UAT results