A grocery chain installs cameras with facial recognition at store entrances to automatically identify loyalty-program members as they walk in, but it does not post any signage, update its privacy policy, or otherwise tell shoppers that facial recognition is running or how the images are used. Which responsible AI principle is most directly violated?

The correct answer is A. Transparency requires that people affected by an AI system understand that it is being used and how it works, and the grocery chain's failure to disclose the facial recognition system through signage or an updated policy directly violates that expectation. Option B is incorrect because fairness concerns whether an AI system treats different groups of people equitably, such as recognition accuracy varying across demographics, which is a separate issue from whether shoppers were told the system exists. Option C is incorrect because inclusiveness concerns designing systems that work well for and empower people of varying abilities and backgrounds, not the act of disclosing a system's presence. Option D is incorrect because accountability concerns having identifiable people and processes responsible for how an AI system behaves and for remediating problems, which is a governance concern distinct from the lack of customer notice described here. Since the core problem in the scenario is that shoppers were kept in the dark about a system observing them, transparency is the principle at stake.