React | Lists and Keys | Question 8

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What is the output of the following code?

JavaScript 
const items = ['Apple', 'Banana', 'Apple'];
return (
    <ul>
        {items.map((item, index) => <li key={index}>{item}</li>)}
    </ul>
);

A list with duplicate keys

A list with unique keys

A list with no keys

An error due to duplicate keys

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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