An independently rotating large cup affixed to the top of a fence prevents the hands of intruders from gripping the top of a fence to climb over it.
Question
                An independently rotating large cup affixed to the top of a fence prevents the hands of intruders from gripping the top of a fence to climb over it. What is the name for this technology? – Q/A (Question and Answer)
                  
                Test Answer
Answer:
roller barrier
Recource Computer Security 4,5,10
                        
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