When introducing new features to a large, existing product, the product team should employ the Minimum Business Increment (MBI) technique. An MBI is the smallest piece of functionality that can be delivered that provides value to the business. It allows teams to deliver business value quickly while minimizing risk and ensuring that only essential, incremental changes are introduced. This approach is particularly useful for managing the complexity of large, established products and ensuring that new features are aligned with business goals.

Disciplined Agile (DA) is defined as a process-decision toolkit that offers a broad range of guidance to help individuals, teams, and organizations streamline their processes in a way that makes sense given their unique context. DA is not a specific methodology; instead, it provides a toolkit that integrates various agile, lean, and traditional strategies, allowing teams to choose the best approach for their situation.

A. An agile set of practices promoting autonomy within a PMO is not accurate, as DA is broader than just a PMO.

C. An approach that frequently assesses change is not the specific purpose of DA.

D. A methodology exploring various agile and waterfall practices does not accurately represent DA's comprehensive and context-sensitive nature.

Therefore, the correct answer is B. It is a process-decision toolkit that provides straightforward guidance to help people, teams, and organizations to streamline their processes in a context-sensitive manner .

On a Disciplined Agile Delivery (DAD) team, the Architecture Owner is a primary role. The Architecture Owner is responsible for guiding the team in making sound architectural decisions and ensuring that the architecture evolves appropriately to support the team's work. This role involves collaborating with the team to address architectural concerns, mitigate technical risks, and ensure alignment with the overall technical vision. The Architecture Owner also helps the team navigate complex technical decisions and is a key player in maintaining the integrity of the system architecture.

In Agile and Disciplined Agile practices, iterations are planned at the beginning of each iteration during an iteration planning meeting. The team, along with the product owner, pulls the highest-priority items from the product backlog that they believe can be completed within the iteration. This ensures that the work is well-defined, understood, and aligned with the current goals and priorities.

A. Retrospective meetings focus on reflecting on the past iteration to identify improvements, not planning the next iteration.

B. Using iteration reviews improves quality but is not about planning.

D. Iteratively planning by the product owner alone does not ensure team alignment or collaboration, which is essential in Agile.

Therefore, the correct answer is C. At the beginning of each iteration by pulling from the product backlog .

In Disciplined Agile (DA), the Team Member role is primarily responsible for building the product correctly. Team Members are the individuals who directly create the product by writing code, testing, designing, and performing other tasks necessary to deliver a working solution. The Architecture Owner may guide architectural decisions, and the Team Lead may facilitate processes, but it is the Team Members who actively build the product and ensure it meets the required standards and specifications.