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Option 3 : (iv) only

Let us examine the inferences one by one:

  1. Smart cities use technology to ensure safety and security but that does not mean they promote surveillance. Thus this does not follow.
  2. There is no information in the passage that helps us infer whether surveillance is an integral part of the smart city. Thus this cannot be inferred.
  3. Though sustainability has been considered as an important part of the smart city, surveillance is only promoted by the technology used indirectly. Thus this cannot be inferred.
  4. The critics sometimes perceive the use of technology in smart cities as a way to surveillance. Thus this is a logical inference.
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