A technician has developed training material to ensure employees physically secure company laptops from being stolen. Which of the following is a preventative directive that MUST be included in the…

RFID tagging systems detect when a laptop leaves an area but do not prevent the theft - they are detective controls, not preventative controls, and involve significant infrastructure cost.

Biometric devices secure access to the laptop's data after theft but do not prevent the physical device from being stolen - this is a data security control, not a theft prevention measure.

Privacy filters prevent visual eavesdropping on screen contents but offer no protection against the physical theft of the laptop itself.

Physical access control through locked doors is a fundamental, cost-free, and immediately actionable security measure that prevents unauthorized individuals from entering a space and stealing laptops. Training employees to lock doors even during brief absences directly addresses the primary vector for laptop theft in office environments.