You are developing a Windows Communication Foundation (WCF) service. One of the service operations contains the following code. You need to set a service behavior that prevents two or more threads…

You are developing a Windows Communication Foundation (WCF) service. One of the service operations contains the following code. You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time. Which code segment should you use to set the service behavior?