How does the Managing a Stage Boundary process support the focus on products principle?

Question $22$Answer

A$.$

Prepares and distributes an interim report on what has gone well

B$.$

Reviews and if necessary updates the project management team for the next stage

C$.$

Replans a stage in response to a forecast deviation from tolerance

D$.$

Documents the agreed level of quality for each of the deliverables of the next stage