Which of the following pairs of an acronym and its expansion is incorrectly matched?

AGPS: Global Positioning System

BGSM: Global System for Management ✓ Correct

CSIM: Subscriber Identity Module

DWiMAX: Worldwide Interoperability for Microwave Access

Correct answer: (B) GSM: Global System for Management

Explanation

GSM stands for Global System for Mobile Communications, so its expansion given as Global System for Management is wrong.

GSM is the digital cellular standard that lets phones make calls and send data over mobile networks.

GPS correctly expands to Global Positioning System, a satellite network that gives location and time.

SIM correctly expands to Subscriber Identity Module, the small card that stores a subscriber's number and authentication details.

WiMAX correctly expands to Worldwide Interoperability for Microwave Access, a long-range wireless broadband technology.

GSM introduced the SIM card idea, letting users switch phones by simply moving the card.

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