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Now let's see how object oriented analysis might work

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in practice by considering the following requirement for an online

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shopping website. The requirement says that users can add

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more than one item on sale at a time to

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a shopping cart. So, looking at this requirement I

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would like you to tell me which of the following

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elements should be modeled as classes. And the elements

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are: item, sale, shopping cart, time and user. So mark

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all that apply.