The correct answer is A - Send the member to training. Agile encourages cross-functional teams and continuous improvement. When a team member identifies a skill gap that affects delivery, addressing it promptly through training or mentoring increases team capability and autonomy.
From the PMI Agile Practice Guide:
"Agile teams strive for cross-functionality. When skill gaps hinder progress, organizations support learning to reduce dependencies and improve throughput." (PMI Agile Practice Guide, Section 4.3 - Continuous Learning and Team Development) Mike Griffiths adds:
"Empowering team members through skill development enhances flexibility and velocity. Encouraging proactive learning improves team performance." (Mike Griffiths, PMI-ACP Exam Prep, Chapter 7 - Continuous Improvement) Incorrect options:
* B defers ownership of the solution.
* C unnecessarily delays action.
* D delays learning due to unnecessary constraints.

Explanation/Reference:

The correct answer is D - Planning poker.
Planning poker is a consensus-based estimation technique commonly used in Agile projects. During this technique, team members discuss user stories, clarify details, and independently assign story points. The facilitator (often the Scrum Master) ensures balanced participation. This process encourages team collaboration and reduces estimation bias.
From the PMI Agile Practice Guide:
"Planning poker is a common estimation technique where team members discuss the story, then individually provide estimates using a card deck, reaching consensus over multiple rounds." (PMI Agile Practice Guide, Section 5.3 - Estimation Techniques) Mike Griffiths adds:
"Planning poker is based on Wideband Delphi and allows teams to converge on estimates through discussion and consensus. It is particularly useful for relative estimation of story points." (Mike Griffiths, PMI-ACP Exam Prep Book, Chapter 5 - Adaptive Planning) Why other options are incorrect:
* A (Lessons learned) applies to retrospective activities, not estimation.
* B (Wideband Delphi) is the foundation of planning poker but is more formal and anonymous.
* C (Formal point counting) is not a standard Agile estimation technique.

Explanation/Reference: https://resources.collab.net/agile-101/agile-sprint-planning-iteration-planning