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.