Which two statements are true about the Project Management Plan during the Project Execution and Control Phase?

Which two statements are true about the Project Management Plan during the Project Execution
and Control Phase?

A.
It should not change after it has been agreed to and signed off by the project sponsor.

B.
As the project evolves and you find areas for improvement, the changes need to be reflected in
the Project management Plan.

C.
Any changes to it need to be signed off by the client.

D.
It needs to be updated by the Change Control Board.