According to the PMBOK® Guide (specifically the Plan Risk Management and Identify Risks processes), risk assessment requires a diverse group of participants who possess the knowledge of the project ' s technical details, its strategic importance, and its operational execution.

Why Choice C (SMEs) is correct: Subject Matter Experts provide " Expert Judgment, " which is a primary tool and technique for identifying and analyzing risks. They understand the technical nuances and external factors that could impact specific work packages or deliverables.

Why Choice D (Project Sponsor) is correct: The Project Sponsor is responsible for the project ' s high-level success and provides the Risk Appetite and Risk Thresholds. Their participation is crucial for determining which risks are acceptable and which require significant mitigation resources or contingency funds.

Why Choice E (Project Team) is correct: The Project Team is responsible for the day-to-day execution of the project. They have the most intimate knowledge of the project ' s constraints, dependencies, and assumptions. Their involvement ensures " bottom-up " identification of risks that management might otherwise overlook.

Analysis of other options:

A (End user): While end users are critical for defining requirements and performing UAT, they are not typically required participants in a formal risk assessment meeting during the planning process unless the project specifically involves high user-interface risk.

B (Product owner): In a traditional project management context (which this question ' s phrasing suggests), the Product Owner is an Agile-specific role. While they perform risk management in Agile, in a general PMI risk assessment meeting, the Sponsor and Team take precedence. If the question implies a Hybrid or Agile environment, the Product Owner would be involved, but in a " choose three " scenario, the core triad for risk remains the Sponsor (Authority), Team (Execution), and SMEs (Technical Knowledge).

By involving these three groups, the Project Manager ensures a comprehensive Risk Register that balances technical feasibility, executive risk tolerance, and practical execution challenges.