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The factors that determine the quality of a software system are

  1. correctness, reliability
  2. efficiency, usability, maintainability
  3. testability, portability, accuracy, error tolerances, expandability, access control, audit
  4. All of the above
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Answer : All of Above 

The ISO 9126-1 software quality model identifies 6 main quality characteristics, namely:
Functionality
Reliability
Usability
Efficiency
Maintainability
Portability

Reference : For More Depth See here if you need even more then See this

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