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You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.

You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object.
What should you do?

• A. Implement the IExtensibleDataObject interface in the Person class.
• B. Implement the IExtension<> interface in the Person class.
• C. Add the following KnownType attribute to the Employee class and to the Customer class. [KnownType(typeof(Person))]
• D. Add the following KnownType attributes to the Person class. [KnownType(typeof(Employee))] [KnownType(typeof(Customer))]

You are developing a Windows Communication Foundation (WCF) service.
You must record all available information for the first 1,000 messages processed, even if they are malformed.
You need to configure the message logging section of the configuration file. Which configuration segment should you use?

• A. Option D
• B. Option B
• C. Option C
• D. Option

You are developing a Windows Communication Foundation (WCF) service.
The service operation takes a customer number as the only argument and returns information about the customer. The service requires a security token in the header of the message.
You need to create a message contract for the service.
Which code segment should you use?

• A. <ServiceContract()>
  Public Interface IService
  <OperationContract()>
  Function GetCustomerInformation(
  ByVal header As Header, ByVal customerNumber As Integer) As CustomerInformation End Interface <MessageContract()> Public Class CustomerInformation End Class <MessageContract()> Public Class Header <MessageHeader()> Public SecurityTag As String End Class
• B. <ServiceContract()>
  Public Interface IService
  <OperationContract()>
  Function GetCustomerInformation(
  ByVal header As Header,
  ByVal customerNumber As Integer)
  As CustomerInformation
  End Interface
  <DataContract()>
  Public Class CustomerInformation
  End Class
  <MessageContract()>
  Public Class Header
  <MessageHeader()>
  Public SecurityTag As String
  End Class
• C. <ServiceContract()> Public Interface IService <OperationContract()> Function GetCustomerInformation( ByVal request As CustomerNumber) As CustomerInformation End Interface <MessageContract()> Public Class CustomerInformation End Class <MessageContract()> Public Class CustomerNumber <MessageHeader()> Public SecurityTag As String <MessageBodyMember()> Public CustomerNumberElement As Integer End Class
• D. <ServiceContract()> Public Interface IService <OperationContract()> Function GetCustomerInformation( ByVal request As CustomerNumber) As CustomerInformation End Interface <DataContract()> Public Class CustomerInformation End Class <MessageContract()> Public Class CustomerNumber <MessageHeader()> Public SecurityTag As String <MessageBodyMember()> Public CustomerNumberElement As Integer End Class

A client application calls a Windows Communication Foundation (WCF) service with a proxy class that was generated by Visual Studio.
The service binding was changed from wsHttpBinding to basicHttpBinding. The method signatures in the service contract are changed.
After these changes, the client application receives errors when calling methods on the service.
You need to ensure that the client can invoke methods on the service successfully.
What should you do?

• A. Enable anonymous authentication for the service.
• B. Update the service reference.
• C. Copy the configuration file elements under the <system.servicelviodel> element from the service back to the client.
• D. Update the configuration file to use basicHttpBinding.

You are working with a Windows Communication Foundation (WCF) client application that has a generated proxy named SampleServiceProxy.
When the client application is executing, in line 02 of the following code, the channel faults (Line numbers are included for reference only.)
01 SampleServiceProxy proxy new SampleServiceProxy()
02try
03{
04proxy Processlnvoice(invoice);
05)
06catch
07{
08 (proxy. State == CommunicationState. Faulted)
09{
11)
12)
13 proxy Update Customer(customer);
You need to retumn proxy to a state in which it can successfully execute the call in line 13.
Which code segment should you use at line 10?

• A. proxy new SampleServiceProxy0;c
• B. proxy.Open()
• C. proxy.AbortO,
• D. proxy.CloseO;