When comparing communication styles, which of the following are true?

Who typically has the best insight into task execution?

During a mature agile team's planning meeting, a team member proposes a new framework that would considerably reduce implementation time. However, the team lacks the confidence to try the new framework.
To help the team gain confidence, what should the agile practitioner suggest?

An agile team's client has been asked to expedite the delivery of the next release. By delivering one month early, the company can generate US$40,000 more than expected for the quarter.
What should the agile team do?

According to the fundamental principles of Lean Management, errors result from: