Which of the following would be most likely to assist when a customer has difficulty prioritizing stories?

A team is delivering work as per the sprint plan, and team velocity is stabilized. However, at the end of the release, the customer is dissatisfied with project quality. What should the agile project manager have done to avoid this?

The best reason for extreme character personas in writing user stories is to:

The product owner is present at the sprint review meeting and states that an estimation for the end of the project must be shared with the company's steering committee. The scrum master declares that the team reached an average velocity of 40 story points per sprint, considering a biweekly iteration. The team members predict that there are 240 story points remaining.
What is the estimated project conclusion?

Which of the following is an example of a visual aid used in Lean-Agile software development?