You create a Windows Communication Foundation service by using Microsoft .NET Framework 3.5.
You write the following code segment.

You need to ensure that concurrent calls are allowed on the service instance.
Which code segment should you insert at line 07?

• A. [ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Multiple, ReleaseServiceInstanceOnTransactionComplete=false)]
• B. [ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Multiple, ReleaseServiceInstanceOnTransactionComplete=true)]
• C. [ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Reentrant, ReleaseServiceInstanceOnTransactionComplete=true)]
• D. [ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Reentrant, ReleaseServiceInstanceOnTransactionComplete=false)]

You are creating a Windows Communication Foundation service by using Microsoft .NET Framework 3.5. The service contains the following code segment.

You need to ensure that the service meets the following requirements:
Which code segment should you use to replace the existing code segment?

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

You create an application by using Microsoft Visual Studio .NET 2008 and the .NET Framework 3.5. The application processes sales order documents. The application contains a component that retrieves the sales order documents from a FTP server and stores the data in a Microsoft SQL Server database. You need to ensure that the component meets the following requirements:
Periodically polls the FTP server to check for new order documents Executes without dependencies on other software components Executes without user interaction Executes by using a specific security context Allows system administrators to change the security context by retaining the same component code.
What should you do?

• A. Develop the component as a Windows service.
• B. Develop the component as a Windows Communication Foundation service.
• C. Develop the component as a Windows application.
• D. Develop the component as a Web service.

You are creating a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5. You create a class named Customer for the WCF service. The Customer class has properties named Id, Name, and BalanceDue.
You plan to convert the Customer class into a data contract.
You need to ensure that only the Id property and the Name property are passed to the client applications.
Which code segment should you use?

• A. <DataContract()> _
  Public Class Customer
  Public Property Id() As Integer
  ...
  End Property
  Public Property Name() As String
  ...
  End Property
  Private Property BalanceDue() As Double
  ...
  End Property
  End Class
• B. <DataContract()> _
  Public Class Customer
  <DataMember()> _
  Private Property Id() As Integer
  ...
  End Property
  <DataMember()> _
  Public Property Name() As String ... End Property Public Property BalanceDue() As Double ... End Property End Class
• C. <DataContract()> _ Public Class Customer <DataMember()> _ Public Property Id() As Integer ... End Property <DataMember()> _ Public Property Name() As String ... End Property <DataMember(EmitDefaultValue:=False)> _ Public Property BalanceDue() As Double ... End Property End Class
• D. <DataContract()> _ Public Class Customer <DataMember(EmitDefaultValue:=True)> _ Public Property Id() As Integer ... End Property <DataMember(EmitDefaultValue:=True)> _ Public Property Name() As String ... End Property <DataMember()> _ Friend Property BalanceDue() As Double ... End Property End Class