You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application uses the LINQ ParallelEnumerable. AsParallel method to perform multiple queries on a database. You need to ensure that queries can execute on separate threads concurrently. What should you do? （）

• A、 Use the AsOrdered method.
• B、 Use the SelectMany method.
• C、 Use the AutoBuffered option in the WithMergeOptions method.
• D、 Use the WithExecutionMode method with the ParallelExecutionMode.ForceParallelism parameter.