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Modifying the software by restructuring is called

  1. Adaptive maintenance
  2. Corrective maintenance
  3. Perfective maintenance
  4. Preventive maintenance
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official ans was perfective maintenance which is also given in many books 

in some literature  preventive is also correct restructuring or documentation updates (often referred to as "preventive" maintenance)

https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nbsspecialpublication500-129.pdf

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Perfective maintenance

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Perfective Maintenance means the process of modifying Software or Applications to implement new or changed user requirements which concern functional enhancements...

C. Perfective maintenance ...

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