An assistant that answers policy questions occasionally states a refund window that does not exist in any company document, phrased with complete confidence. An engineer proposes waiting for the next model release to fix it. What is the most accurate assessment?

• AThe behaviour is a defect in this particular model and a newer release will remove it.
• BThe behaviour indicates the model was fine tuned on incorrect data and should be retrained.
• CSetting temperature to zero will remove the behaviour entirely.
• DHallucination follows from how the technology works, so the system needs grounding, citation or human review rather than a newer model.