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>