The lessons-learned activity and formal acceptance documentation form part of which of the following process groups?

The Closing Process Group is dedicated to finalizing all project activities, including documenting comprehensive lessons learned for organizational knowledge and obtaining formal acceptance of the project deliverables from the client or sponsor.

The Planning Process Group focuses on defining the project scope, objectives, and course of action, not on capturing lessons learned or securing formal acceptance at the project's end.

The Executing Process Group involves performing the work to achieve project objectives, rather than concluding the project through documentation of lessons or formal acceptance.

The Monitoring/Controlling Process Group tracks, reviews, and regulates project progress and performance, but it does not encompass the final formal closure activities like lessons learned or acceptance.