GSM (Global System for Mobile) was earlier also known as . . . . . . . .

The correct answer is: D. Global Special Mobile

GSM (Global System for Mobile) was earlier also known as Global Special Mobile. It is a standard for digital cellular networks that was developed in Europe in the 1980s. GSM is the most widely used mobile phone standard in the world, with over 5 billion subscribers.

The other options are incorrect. Option A, Group System Mobile, is not a valid acronym. Option B, Global Special Meaning, is not a

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