Contract file and formal acceptance and closure are outputs of which processes?

Which group creativity technique asks a selected group of experts to answer questionnaires and provide feedback regarding the responses from each round of requirements gathering?

The planned cost for the total project at its inception is called the _____.

The project manager and relevant stakeholders agreed on the final product functionality. There are more items included in the final functionality list than there are in the project charter.
What should the project manager do to resolve this?

Enterprise environmental factors are an input to which process?