-It must minimize the transmission size by attaching the XML document as is without using escape characters or base64 encoding.
-It must interoperate with systems that use SOAP but are not built on the .NET plafform. You need to configure the service to support these requirements. Which message encoding should you use?
Binary message encoding
MTOM (Message Transmission Optimization Mechanism) message encoding
Text message encoding with message version set to none
Text message encoding with message version set to SOAP 1.2