According to the passage, some governments still use typewriters because:
they do not want to abandon old technologies that may be useful in the future
they want to ensure that typewriter production lines remain in business
they like the nostalgic appeal of typewriter
they can control who reads the document
they can control who reads the document
The passage talks about how Russians and certain American organisations use the typewriter as it prevents snooping. This is given in option (4).