学生已经掌握了“哺乳动物”的概念，再去学习新概念“鲸”时，很快予以接受。这一掌握概念的形式是（)A．

You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.var service = new WarehouseService(); var host = new ServiceHost(service);You need to ensure that new operations do not wait for previous operations to finish.Which attribute should you use to decorate the service？（）

A. [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Multiple)]

B. [CallbackBehavior(ConcurrencyMode=ConcurrencyMode.Multiple)]

C. [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Single)]

D. [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Reentrant)]

ound application will host a Windows Communication Foundation (WCF) service and must be active as soon as the machine is running. The background application will not have a user interface. A front-end application will consume the WCF service and will provide the user interface.You need to choose a host environment for the WCF service.Which hosting environment should you choose？ （）

A. Microsoft Internet Information Services (IIS) 6.0

B. Windows Process Activation Services (WAS)

C. A Windows Forms application

D. A Windows Service

You are developing a Windows Communication Foundation (WCF) service. The service configuration file has a element defined. You need to ensure that all security audit information, trace logging, and message logging failures are recorded.Which configuration segment should you add to the element？（）

A.

B.

C.

D.

You are hosting a Windows Communication Foundation (WCF) service under Microsoft Interent Information Services (IIS) 7.0.You have set up a web site in IIS Manager. The physical path is c:\wwwroot\Calendar.There is a Calendar.svc file in the c:\wwwroot\Calendar folder. It contains the following directive:<% @ServiceHost Language="C" Debug="true" Service="Calendar.Calendar" CodeBehind="CalendarSvc.cs" %>The CalendarSvc.cs file contains the source for the Calendar class in the Calendar namespace.You compile this code into the Calendar.dll file. You need to deploy your service to the web site. What should you do？（）

A. Copy the Calendar.dll file to the c:\wwwroot\Calendar\code folder

B. Copy the Calendar.dll file to the c:\wwwroot\Calendar\bin folder

C. Copy the Calendar.svc.cs file to the c:\wwwroot\Calendar\bin folder

D. Copy the Calendar.svc.cs file to the c:\wwwroot\Calendar\code folder

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.

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.

B.

C.

D.

You are developing a Windows Communication Foundation (WCF) service that will be hosted in Microsoft Internet Information Services (IIS) 7.0.The service must be hosted in an lIS application named Info. You need to enable this service to be hosted in llS by changing the web.config file.Which XML segment should you add to the web.config file？（）

A.

B.

C.

D.

You are developing a Windows Communication Foundation (WCF) service that will be hosted in Microsoft Internet Services (IIS) 7.0.The service must be hosted in an IIS application named Info. You need to enable this service to be hosted in IIS by changing the web.config file.Witch XML segment should you add to the web.config file？（）

A.

B.

C.

D.

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.

B.

C.

D.

A Windows Communication Foundation (WCF) solution provides a session-based counter.The service is self-hosted. The hosting code is as follows:ServiceHost host = new ServiceHost(typeof(CounterService));NetTcpBinding binding1 = new NetTcpBinding(SecurityMode.None);host.AddServiceEndpoint("MyApplication.ICounterService", binding1, "net.tcp://localhost:23456");host.Open();This service is currently exposed over TCP, but needs to be exposed to external clients over HTTP. Therefore, a new service endpoint is created with the following code:host.AddServiceEndpoint("MyApplication.ICounterService", binding2, "http://localhost:12345");You need to complete the implementation and ensure that the session-based counter will perform over HTTP as it does over TCP.What should you do？（）

A.

B.

C.

D.