Which of the following types of technologies would be the MOST cost-effective method to provide a reactive control for protecting personnel in public areas?

Which of the following types of technologies would be the MOST cost-effective method to provide a reactive control for protecting personnel in public areas?
A . Install mantraps at the building entrances
B . Enclose the personnel entry area with polycarbonate plastic
C . Supply a duress alarm for personnel exposed to the public
D . Hire a guard to protect the public area

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Answer: D