What is a 'Teletext'?

Options :
  1. It is the flashing of telephone conversation on TV screen.
  2. It is flashing the text of the message on the telex machine.
  3. It is connecting the local telephones with outstation telephones without code numbers.
  4. It is flashing of the text of news and information on the TV screen.
Answer and Explanation :-

Answer: Option 4


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I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
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