Which of the following best describes the approach for determining the iteration (timebox) length?
a) Iterations (timeboxes) should always be 30 days
b) The team determines iteration (timebox) length by dividing the total number of story points by the average velocity of the team
c) Iterations (timeboxes) should always be two weeks
d) The team should agree on the length of the iteration (timebox) taking the size and complexity of the project into consideration