Why do quiz questions treat Stock Groups and Categories separately?



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Why do quiz questions treat Stock Groups and Categories separately when Tally Textbooks tell us that they can be used interchangeably as per our business needs.

I got a quiz question marked incorrect because of this. The question was that' __________ is used to distinctively classify goods based on their specific nature or type or brand in order to generate customized inventory reports'. I chose Groups as the answer. However the correct answer was Categories.

When textbooks tell us that Groups and Categories can be used interchangeably with each other (i.e. I can use brands for groups like Shailesh Sir showed us in his video or use it for Categories) why does the quiz mark it wrong??