What are two possble ways to achieve this goal?

A WCF service code is implemented as follows. (Line numbers are included for reference only)

You need to increase the rate by which clients get the required response from the service. What are two possble 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 senvice.

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