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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def security(self):
 """ Creates a reference to the Security operations for Portal """

        url = self._url + "/security"
        return _Security(url=url,
                         securityHandler=self._securityHandler,
                         proxy_url=self._proxy_url,
                         proxy_port=self._proxy_port)