You are creating an XML Web service that processes highly confidential messages. The service exposed a Web method named Retri- eveMessage that takes as input a code name and returns an encrypted message.You create a SOAP extension and override the extension's Process Message method so that you can encrypt the message before it is sent back to the caller.You need to encrypt only the data within the RetrieveMessageResult node of the SOAP response. You create a function named EncryptMessage that encrypts the RetrieveMessageResult node. You need to ensure that this method gets called before sending the message back to the caller.During which SoapMessageStage should you call EncryptMessage?