The correct answer is B. Near-field communication (NFC).
According to the CompTIA A+ Core 1 220-1201 objectives under Mobile Devices and Security:
NFC is commonly used for secure access control. Many organizations implement NFC-enabled ID badges or mobile devices to unlock doors, gates, or secure areas.
The mobile device communicates over a very short range (a few centimeters) with a reader to authenticate the user.
Why the other options are incorrect:
A. Hotspot: Provides internet access, not physical building access.
C. Infrared scanner: While used in some legacy devices, it is not commonly implemented for secure mobile access.
D. Geolocation: Can provide location awareness but does not grant direct access to secure physical spaces.
[References:, CompTIA A+ Core 1 (220-1201) Exam Objectives – Mobile Devices: “Given a scenario, configure mobile device features including secure access and authentication methods such as NFC and Bluetooth.”, Mike Meyers’ CompTIA A+ Certification Guide, 13th Edition, Chapter on Mobile Device Security and Access Control., , , , , , , , , , , , ]
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