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Physical security-It is characterized by any physical aspect of security such as architecture, securityguards , protective barriers ,Natural surveillance is one term that can be applied to when architects construct an area to enhance visibility.
Technical security-Technical security includes any technology that is used alongside physical security measures to maintain security Examples of technical security can be "intrusion detection systems, door alarms In terms of border control, our nation's Border Patrol can use.
Operational security- It specifically refers to the policies and procedures determining what is secure and insecure and how to respond in the event of a security breach Examples of operational security would be emergency plans, crisis management plans, guard post orders, etc
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