Atlas computer vision solution can cope with the maintenance pressure of public areas such as residential areas and parks. Which of the following is not a safety hazard brought by urban public spaces?

Atlas computer vision solution can cope with the maintenance pressure of public areas such as residential areas and parks. Which of the following is not a safety hazard brought by urban public spaces?
A . Although employees, tenants, visitors, strangers and suspicious persons are monitored by traditional video surveillance, traditional surveillance often cannot be traced back to the actual event.
B . Crowded areas with high concentrations of people may easily lead to safety accidents
C . Cards used for identification cannot guarantee authentication consistency
D . Lack of obvious guidance and restrictions for outsiders

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Answer: D