You are developing a Windows Communication Foundation (WCF) service that contains the following operation contract. [OperationContract] CustomerNames GetCustomerNames（ ）; The operation returns customer names. You need to develop a definition for the operation contract that produces XML with the following structure. 
Which code segment should you use? （）。 
- A、
- B、
- C、
- D、
正确答案:A
答案解析:有
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