Consider Amazon online shopping application where the users can login and purchase various items. There are two people, Ahmed and Ali, trying to buy a specific phone but it is out of stock now. There is a guide option “notify me when product is available”. Customers can register on that; receive a notification message when this product is available. Select a pattern for the given scenario, and design your suggested solution. Provide an explanatory justification. Also, indicate the category of the selected pattern. design patterns
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