Explanation
This answer is based on the best practice of involving the stakeholders in the project as early as possible, especially during the transition and closing phase. By engaging the operations support team in the early release, the project manager can ensure that they are familiar with the project deliverables, requirements, and acceptance criteria. This will also help to identify and resolve any issues or gaps before the final transition and closure. This approach will reduce the transition risk and increase the likelihood of project acceptance by the operations support team. References: (Project Management Professional (PMP) Reference Materials source and documents) A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter
8: Delivering Outcomes, Section 8.3: Transitioning Outcomes, page 194.
The Standard for Project Management, Part 2: Value Delivery System, Section 2.5: Project Closure, page 67.