The correct answer is D - Identify this as a risk, decide on the response, and prioritize spike to determine the solution on the product backlog.
A spike is a time-boxed research activity used in Agile to explore potential solutions to uncertainty. The architectural concern is a technical risk, and it's best addressed by formally identifying it, analyzing potential responses, and scheduling a spike as a backlog item to investigate solutions.
PMI Agile Practice Guide:
"Spikes are stories used for time-boxed research and exploration when the team needs more information to understand technical or functional uncertainty." (PMI Agile Practice Guide, Section 5.2 - Types of Backlog Items) Mike Griffiths:
"Agile risk management integrates spikes and prioritization. When risk is detected, the team should identify it transparently and explore mitigation or investigation through a spike." (PMI-ACP Exam Prep, Chapter 6 - Problem Detection and Resolution) Incorrect options:
* A skips backlog prioritization and team alignment.
* B deflects the issue without analysis.
* C ignores risk and blindly follows the existing priority.