You run the following PHP script:
<code>
<?php include(“xml.inc”);
if (!$dom = domxml_open_mem($xmlstr)) {
echo “Error while parsing the XML document \n”;
exit;
}
$a = **********
print_r($a);
?>
</code>
Which of the following functions will you use instead of * if you want to print the root element of the
XML file?

A.
$node->parent_node();

B.
$dom->document_element();

C.
$dom->root_node();

D.
$dom->root_element();