A company wants to prevent unauthorized entry to its server room. Employees will be issued proximity cards that they must tap against a device at the door; the door unlocks only if the card's credentials are valid. Which of the following physical security controls BEST meets this requirement?
The described control is a badge reader (also called a card reader or proximity-card reader). The reader authenticates the data stored on each employee's badge and unlocks the door only for authorized personnel, thereby restricting access and enhancing physical security. Bollards and fences are perimeter barriers, while video surveillance records activity but does not actively authorize entry.
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