A project manager has completed the following steps: Finished a major IT deployment project, confirmed with the release manager that all systems are working, confirmed that functionality has been verified by the quality assurance team, informed the customer. Which next step should the project manager take? 

Update the risk register, stakeholders, and team members. 

Review, verify, and complete the release documentation. 

Add the lessons learned to the organization knowledge base. 

Ensure that the procurement plan is closed out