A city collects data from traffic cameras and changes signals on congested routes. What use of ICT does this illustrate?

Correct answer: Real-time data-based traffic management

The governing concept is ICT-supported, data-based decision-making in a smart city. Traffic cameras collect current observations, a system processes or analyses those observations, and authorities use the result to change signals on congested routes. This is more than storing pictures because the data directly guides a timely action. Personal entertainment and paper communication do not describe the process, so option D is correct.