Which WSDL fragment is a valid portType element for a WSDL file defining a requestresponse Web service?
A. <portType name="Payroll">
<operation name="fileReport">
<message name="fileReport" mode="request-response"/> </operation>
</portType>
B. <portType name="Payroll">
<operation name="fileReport">
<document name="fileReport" mode="request-response"/> </operation>
</portType>
C. <portType name="Payroll">
<operation name="fileReport">
<input message="fileReportRequest"/>
<output message="fileReportResponse"/>
</operation>
</portType>
D. <portType name="Payroll">
<operation name="fileReport">
<input document="fileReportRequest"/>
<output document="fileReportResponse"/>
</operation>
</portType>
E. <portType name="Payroll">
<operation name="fileReport" type=request-response? <input message="fileReportRequest"/>
<output message="fileReportResponse"/>
</operation>
</portType>
F. <portType name="Payroll">
<message name="fileReport">
<input operation="fileReportRequest"/>
<output operation="fileReportResponse"/>
</message>
</portType>
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