Web services platform elements:
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SOAP,UDDI,WSDL
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XML,XSD,WSDL
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RPC,SOAP,http
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all the above
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first and second
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none of the above
Web services platform core elements are SOAP for messaging, UDDI for service discovery and registry, and WSDL for service description. These three form the foundation - XML and XSD are underlying technologies, RPC is an older paradigm, and HTTP is a transport protocol. SOAP, UDDI, WSDL together provide complete web service functionality.
SOAP, WSDL, and UDDI are the three core building blocks commonly taught as "the" web services platform elements: SOAP handles messaging, WSDL describes the service interface, and UDDI provides the registry for discovery. XML underlies all of them as a data format rather than being a distinct platform element in this classic three-part breakdown.