A key agile principle is that user stories should includeclear acceptance criteria, which must bereviewed and accepted by the product owner. According to thePMI Agile Practice Guide (Section 5.2: User Stories and Acceptance Criteria)andMike Griffiths' PMI-ACP Exam Prep Book (Chapter 6: Value- Driven Delivery), acceptance criteria ensure that the team and product ownershare a clear understandingof what constitutes "done." * Option Ais correct: having the product owner validate acceptance criteria ensures alignment. * Option Baddresses technical quality but not stakeholder dissatisfaction. * Option Cunfairly shifts blame without addressing communication. * Option Dgoes against agile's iterative and flexible nature.