單項選擇題

Which of the following is the most costly countermeasure to reducing physical security risks?物理安全風險的防控措施中,下列哪一項成本最高?()

A .Procedural Controls流程控制
B. Electronic Systems電子系統(tǒng)
C .Security Guards安全守衛(wèi)
D .Hardware Devices硬件設(shè)備

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