Testing that involves observing the people using the product to discover errors and areas of improvement
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Soak testing
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Scalability tetsing
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Usability testing
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Acceptance testing
C
Correct answer
Explanation
Usability testing specifically involves observing real users using the product to discover errors and areas for improvement. It focuses on the user experience, ease of use, and user satisfaction. Soak testing tests longevity, scalability testing tests ability to scale up, and acceptance testing determines if requirements are met. Usability testing directly matches 'observing people using the product to discover errors and improvements'. Option B also has a typo 'tetsing' instead of 'testing'.