An agile project leader wants to ensure that the product vision does not fade away in the team members' minds throughout the course of the project. Which of the following would be the best way for the agile leader to achieve that goal?
选项：

A:Present the product vision statement at the kickoff meeting
B:Display the product vision statement as an information radiator
C:Email the product vision statement to all project stakeholders
D:Re-communicate the product vision at the beginning of each iteration