Which of the following is NOT a part of the physical security activity categories?

Data encryption is not a part of the physical security activity categories because it pertains specifically to protecting information by converting it into a coded format that can only be read or processed by authorized individuals or systems. This is an aspect of information security rather than physical security.

Physical security focuses on the protection of the physical environment and tangible assets from unauthorized access, damage, or interference. This includes aspects such as obstacles and prevention, which involves barriers and deterrents, as well as surveillance and notification, which encompasses monitoring systems and alert mechanisms to detect breaches or unauthorized access. Incident response is also a crucial part of physical security, as it involves the actions taken to address and manage security incidents when they occur.

In contrast, data encryption operates at a different level, concentrating on securing data in its digital form rather than protecting physical premises or assets. Thus, it does not fit within the categories typically associated with physical security activities.