One of the pillars of agile isearly and continuous customer feedbackto ensure that the product being delivered meets stakeholder expectations. According to thePMI Agile Practice Guide (Section 5.3: Reviews and Feedback Loops)andMike Griffiths' PMI-ACP Exam Prep Book (Chapter 4: Stakeholder Engagement),frequent customer reviews (e.g., sprint reviews)ensure alignment and early identification of quality or value issues. * Option Dis correct: regular customer engagement during reviews ensures delivery effectiveness and customer satisfaction. * Option Ais inappropriate-daily stand-ups are for internal team coordination. * Option Breflects a waterfall approach. * Option Cmisplaces the responsibility-requirements evolve and are refined throughout, not fixed up front.