【单选题】
Windows Communication Foundation （WCF） application uses a data contract that has several data members. You need the application to throw a Serialization Exception if any of the data members are not present when a serialized instance of the data contract is deserialized. What should you do？（）
A、 Add the Known Type attribute to the data contract.Set a default value in each of the data member declarations.
B、 Add the Known Type attribute to the data contract.Set the Order property of each data member to unique integer value.
C、 Set the Emit Default Value property of each data member to false.
D、 Set the Is Required property of each data member to true.
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