How can the id attribute of the 2nd baz element from the XML string below be retrieved from the SimpleXML object found inside $xml?

How can the id attribute of the 2nd baz element from the XML string below be retrieved from the SimpleXML object found inside $xml?
<?xml version=’1.0′?>
<foo>
<bar>
<baz id="1">One</baz>
<baz id="2">Two</baz>
</bar>
</foo>
A. $xml->getElementById(‘2’);
B. $xml->foo->bar->baz[2][‘id’]
C. $xml->foo->baz[2][‘id’]
D. $xml->foo->bar->baz[1][‘id’]
E: $xml->bar->baz[1][‘id’]

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