The project for newly manufactured antennae is to be implemented for a high valued customer. Offices are now evaluating customer satisfaction as a part of the project work. The project manager already reported performance levels to all stakeholders and all of them seem to be very happy. The measurement for team performance was done and the team got rewarded for their achievement. What is the next thing the project manager should do? (For Ref Only, Question #: PM-03844) Group of answer choices Solve problems Determine variance Gain formal approval of project management plan Gather final lessons learned