Smart badges enable tracking of which data, and what privacy requirement applies?

• A. Payment transactions
• B. Social media profiles
• C. Weather at the venue
• D. Visitor location and time spent at stands/presentations, with informed consent required

Answer: (D)

Smart badges are used to track where a visitor goes in the venue and how long they spend at stands or presentations. Because this kind of location and dwell-time data can reveal personal habits and interests, collecting it requires informed consent. Participants should be informed about what is being tracked, how it will be used, and they must freely agree before data collection begins, with the option to opt out. The other items—payment transactions, social media profiles, or weather at the venue—aren’t the typical data tracked by smart badges in this context, and weather data isn’t tied to individual engagement analytics.