Services are groups of operations. To create a service contract you usually model operations and specify their grouping. In Windows Communication Foundation (WCF) applications, developers define the operations by creating a method and marking it with the which attribute?
A.	ServiceContractAttribute
B.	DataMemberAttribute
C.	DataContractAttribute
D.	OperationContractAttribute
Answer:D
Services are groups of operations. To create a service contract you usually model operations and specify their grouping. In Windows Communication Foundation (WCF) applications, developers define the operations by creating a method and marking it with the which attribute?
A.	ServiceContractAttribute B.	DataMemberAttribute C.	DataContractAttribute D.	OperationContractAttribute