React | Lists and Keys | Question 9

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What is the key used in this example?

JavaScript 
const users = [{id: 1, name: 'Alice'}, {id: 2, name: 'Bob'}];
return (
    <ul>
        {users.map(user => <li key={user.id}>{user.name}</li>)}
    </ul>
);

user.name

user

user.id

index

This question is part of this quiz :

Lists and Keys in React
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Web Technologies
ReactJS
React Quiz
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