单项选择题
You are debugging a Windows Communication Foundation (WCF) service. The service uses signed and encrypted messages.You need to configure logging so that you can read the contents of the messages.
What should you do?（）
A. Set maxSizeMessagesToLog to 10
B. Set logMessageAtServiceLevel to true.
C. Set maxMessagesToLog to 10.
D. Set logMessageAtTransportLevel to true.
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