Explanation: Answer option B is correct.
The getNamespaces() function is used to retrieve the namespaces used in an XML document from a SimpleXMLElement object. When this function is successfully executed, it returns an array of the namespaces in an XML document. The syntax of the getNamespaces() function is as follows:
- class SimpleXMLElement
- {
- string getNamespaces([ bool $recursive ] )
- }
where recursive is an optional parameter. If it is specified, it returns all namespaces used in parent and child nodes. Otherwise, it returns only namespaces used in the root node. By default, it is false.