A Windows Communication Foundation (WCF) solution exposes the following service over
a TCP binding. (Line numbers are included for reference only.) 01 [ServiceContract] 02
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)] 03 public class
DataAccessService 04 { 05 [OperationContract] 06 public void PutMessage(string message)
07 { 08 MessageDatabase.PutMessage(message); 09 } 10 [OperationContract] 11 public
string[] SearchMessages(string search) 12 { 13 return
MessageDatabase.SearchMessages(search); 14 } 15 } MessageDatabase supports a
limited number of concurrent executions of its methods. You need to change the service to
allow up to the maximum number of executions of the methods of MessageDatabase. This
should be implemented without preventing customers from connecting to the service. What
should you do?

A.
Change the service behavior as follows. [ServiceBehavior(ConcurrencyMode =
ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.Single)]

B.
Add a throttling behavior to the service, and configure the maxConcurrentSessions.

C.
Change the service behavior as follows. [ServiceBehavior(ConcurrencyMode =
ConcurrencyMode.Single, InstanceContextMode = InstanceContextMode.PerSession)]

D.
Add a throttling behavior to the service, and configure the maxConcurrentCalls.