You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms Application.The ServiceHost instance is created in the Form Constructor.You need to ensure that the service is not blocked while the UI thread is busy. What should you do?（）
- A Decorate the service implementation class with the following line of code [ServiceBehavior(UseSyncronizationContext = false)]
- B Decorate the service implementation class with the following line of code [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
- C Call the Invoke method of the form and supply a delegate.
- D Call the BeginInvoke method of the form and supply a delegate.