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Option 3 : (iv) only
Let us examine the inferences one by one:
- Smart cities use technology to ensure safety and security but that does not mean they promote surveillance. Thus this does not follow.
- 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.
- 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.
- 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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