Explain that the testable acceptance criteria are included in each story and it is necessary for the expert to collaborate with the developers, testers, and product owner for common understanding of the solution.

Agree, and ask the developers to explain to the testers how the solution should perform for quality assurance. The testers will demonstrate to the stakeholders how the system should perform to gain acceptance.

Agree, because the developers can copy and paste the requirements and include the technical specifications and performance criteria while writing the stories to save time.

Explain to the project sponsor that the user stories should be assigned to the analysts, because they helped write the requirements and better understand them.