According to the PMBOK Guide and the Agile Practice Guide, when a new stakeholder is identified- especially one who is " actively involved " in upcoming work-the immediate priority is to understand their specific needs, expectations, and influence.
Interpersonal Skills and Stakeholder Engagement: Before a stakeholder can be effectively added to a plan or invited to a meeting, the project manager must perform Stakeholder Analysis. A one-on-one interview is a highly effective tool for gathering the detailed information required to assess their power, interest, and impact on the project. This allows the project manager to build a relationship and determine the most appropriate engagement strategy.
Agile Context: In an Agile/adaptive environment (indicated by the mention of a " Product Owner " and " Product Team " ), understanding the stakeholder ' s perspective on the Definition of Done (DoD) and their specific value drivers is essential before they join collaborative team events.
Analysis of other options based on PMI Standards:
Option A: While the stakeholder will eventually be added to the Communications Management Plan, this is a document update. The question asks how to engage the stakeholder. You cannot effectively plan their communications until you have interviewed them to understand their preferences.
Option C: Inviting a new stakeholder to a Sprint Planning meeting without a prior one-on-one could be disruptive. Sprint Planning is a technical meeting for the team to determine how they will do the work. The stakeholder should be properly onboarded first.
Option D: A questionnaire is a data-gathering tool used for large groups of stakeholders where individual interviews are not feasible. For a single, " actively involved " stakeholder, a questionnaire is too impersonal and less effective than a direct conversation for building trust.
Per PMI standards, the project manager should prioritize high-touch engagement (interviews) over administrative tasks (plan updates) when dealing with key stakeholders to ensure their expectations are aligned with the project ' s strategic objectives from the start.