You administer a Windows HPC Server 2008 cluster for your company. The cluster contains 16 nodes and each node has 8 cores and 16 GB of RAM. You have a Microsoft Message Passing Interface (MPI) job named MyMpiJob.exe. You need to ensure that MyMpiJob.exe runs only on half of the available cores on all 16 nodes. Which command should you run?

A.
Job submit /corespernode:4 mpiexec MyMpiJob.exe

B.
Job submit /numcores:4 mpiexec /cores 4 MyMpiJob.exe

C.
Job submit /numnodes:16 mpiexec /cores 4 MyMpiJob.exe

D.
Job submit /numcores:4 mpiexec MyMpiJob.exe