Which of the following milestones represent a DA project moving from Construction to Transition stage?

In the Disciplined Agile (DA) framework, the transition from the Construction phase to the Transition phase in a project is marked by reaching the milestone of "Sufficient functionality." This milestone indicates that the team has built enough functionality to justify moving into the Transition phase, where the focus shifts from developing the product to deploying it into production. The term "sufficient functionality" aligns with the DA's principles that ensure the solution is viable and meets the stakeholders' needs at a basic level before moving to production deployment and further refinement. Other options like "Production ready" or "Proven architecture" may occur before or after reaching this specific milestone, but "Sufficient functionality" is the key indicator for moving into the Transition phase.