The radiation useful for telecommunication is

Options :
  1. ultrviolet
  2. visible light
  3. cosmic rays
  4. infrared radiation
Answer and Explanation :-

Answer: Option 2

Explanation:

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Even if times got bad, he would never again deny himself the possibility that the future might be happy even if the present was painful. He would allow himself dreams.
-Suzanne Collins Gregor the Overlander