The following XML document is in books.xml. Which code will output "Historical"?

<books>
    <book>
        <title>A Tale of Two Cities</title>
        <author>Charles Dickens</author>
        <categories>
            <category>Classics</category>
            <category>Historical</category>
        </categories>
    </book>
    <book>
        <title>Then There Were None</title>
        <author>Agatha Christies</author>
        <categories>
            <category>Mystery</category>
        </categories>
    </book>
</books>