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2.You have a subscription input field on a client’s website and need a method to ensure that any email address and username in the client's database is unique. What should you use to achieve this? An ordered list because Grace needs to know when each user subscribed to the website A set because each username and email needs to be singular A slice because Grace will have to extract the names of each user from their email address A dictionary because she needs to link each user's name to their email address None of the above
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