During an AI audit, the team finds that an AI-based insurance underwriting model was retrained with new data but the new version was deployed without a change impact assessment or validation. What MOST accurately describes the governance failure?

B is correct because model change management processes ensure that even updates to existing models undergo appropriate impact assessment and validation before deployment. Retraining with new data constitutes a material change that can alter model behavior significantly. Bypassing this process is a governance failure independent of other concerns. Training data documentation (A) is a related concern but not the primary failure. Privacy review (C) and monitoring (D) are separate concerns.