Answer:
The answer is "Option b"
Explanation:
GSM is a cellular network system of the second generation, which is currently used in the world's. It is most useful in a telecommunications network. It is also regarded as open-ended and wireless cellular technology for mobile voice and data transmission, and certain choices were incorrect, which is explained as follows:
- In option a, It is wrong because it is part of the first generation.
- In option c, It works on channels, that's why it is wrong.
- In option d, It is part of wireless communication, that's why it is wrong.