What is the purpose of the Plan-Do-Check-Adjust cycle as applied to Iterations?

1.To allow the team to perform some final backlog refinement for upcoming Iteration planning

2.To provide a regular, predictable development cadence to produce an increment of value

3.To create continuous flow of work to support the delivery pipeline (not correct)

4.To give the Agile Release Train team members a process tool to keep the train on the tracks