A WCF service code is implemented as follows. (Line numbers are included for reference
only.) 01 <ServiceContract()> 02 <ServiceBehavior( 03
InstanceContextMode:=InstanceContextMode.Single)> 04 Public Class CalculatorService
05 06 <OperationContract()> 07 Public Function Calculate(ByVal op1 As Double, 08 ByVal
op As String, ByVal op2 As Double) As Double & 24 End Function 25 26 End Class You
need to decrease the response time of the service. What are two possible ways to achieve
this goal (Each correct answer presents a complete solution?Choose two.)

A.
Change the service behavior to the following. <ServiceBehavior(
InstanceContextMode:=InstanceContextMode.Single,
ConcurrencyMode:=ConcurrencyMode.Multiple)>

B.
Change the service behavior to the following.
<ServiceBehavior(InstanceContextMode:=InstanceContextMode.PerCall)>

C.
Require the clients use threads, the Parallel Task Library, or other mechanism to issue
service calls in parallel.

D.
Require the clients to use async operations when calling the service.