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Which of the following is NOT a common type of specialized IT appliance?
VPN
Switch
Router
None of these
All of These
"Router", "VPN" and "Switch" are each a common type of specialized IT appliance.
-->The answer "All of these" contradicts the question based on the explanation. "Which of the following is NOT a common type of specialized IT appliance." I've added an alternative answer "None of these".
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