You are developing a new version of an existing message contract named CustomerDetailsVersion1. The new version of the message contract must add a Department field of type String to the SOAP header.You create a new class named CustomerDetailsVersion2 that inherits from CustomerDetailsVersion1. You need to ensure that all client applications can consume the service.
Which code segment should you use?（）

单项选择题You are developing a Windows Communication Foundation (WCF) client application. The client application contains the following code. [ServiceContract] public interface ISocialStatus { [OperationContract] [WebInvoke(UriTemplate = statuses update.xml?status-{text} )] void UpdateStatus(string text); } public class SocialClient : ClientBase, ISocialStatus { ... } The configuration file contains the following lines. binding= webHttpBinding contract= SocialApp.ISocialStatus bindingConfiguration= BindingConfig > You need to ensure that the service is consumed. Which code segment should you use?（）

A. var client = new SocialClient("SocialClient"); client.Endpoint.Behaviors.Add(new WebHttpBehavior());
B. var client = new SocialClient("SocialClient"); client.Endpoint.Behaviors.Add(new WebScriptEnablingBehovior());
C. var client = new SocialClient("POST"); client.Endpoint.Behaviors.Add(new WebHttpBehovior());
D. var client = new SocialClient("POST"); client.Endpoint.Behaviors.Add(new WebScriptEnablingBehavior());

单项选择题You are configuring services to be discoverable. The services must be discoverable without relying on a central server. Client applications that consume the services are on a network segment that is separate from the network segment that the services are located on.A firewall blocks all TCP ports between the two network segments, but allows other protocols to pass through.You need to ensure that the client applications can discover the services. What should you do?（）

A. Use ad-hoc discovery mode over HTTP.
B. Use ad-hoc discovery mode over UDP.
C. Use managed discovery mode over HTTP.
D. Use managed discovery mode over UDP.

单项选择题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. Update the configuration file to use basicHttpBinding.
B. Enable anonymous authentication for the service.
C. Copy the configuration file elements under the element from the service back to the client.
D. Update the service reference.

单项选择题A Windows Communication Foundation (WCF) service is hosted in Microsoft Internet Information Services (IIS). You are preparing the configuration file for production deployment. You need to set up tracing so that an administrator can adjust the System.ServiceModel trace level without causing the ASP.NET host application domain to restart. You need to ensure that tracing is turned off by default. What should you do?（）

A.
B.
C.
D.

单项选择题You are developing a Windows Communication Foundation (WCF) service to replace an existing ASMX Web service.The WCF service contains the following code segment. (Line numbers are included for reference only.) 01 [ServiceContract()] 02 03 public interface IEmployeeService 04 { 05 [OperationContract()] 06 EmployeeInfo GetEmployeeInfo(int employeeID); 07 08 } 09 10 public class EmployeeService : IEmployeeService 11 { 12 13 public EmployeeInfo GetEmployeeInfo(int employeeID) 14 { 15 ... 16 } 17 } 18 19 20 public class EmployeeInfo 21 { 22 ... 23 public int EmployeeID { get; set; } 24 public string FirstName { get; set; } 25 public string LastName { get; set; } 26 27 }The existing Web service returns the EmployeelD as an attribute of the Employeelnfo element in the response XML.You need to ensure that applications can consume the service without code changes in the client. What should you do?（）

A. Insert the following code at line 02. [DataContractFormat()] Insert the following code at line 22. [DataMember()]
B. Insert the following code at line 02. [XmlSerializerFormat()] Insert the following code at line 22. [XmlAtttibute()]
C. Insert the following code at line 09. [XmlSerializerFormat()] Insert the following code at line 22. [XmlAttribute()]
D. Insert the following code at line 19. [DataContractFormat()] Insert the following code at line 22. [DataMember()]