You submit a Microsoft Message Passing Interface (MPI) job named App.exe to a Windows HPC Server 2008 cluster. The job is designed to use exactly eight ranks. The job achieves the highest efficiency with one MPI rank for each physical processor. You do not know the number of nodes in the cluster. You need to ensure that the following requirements are met:
App.exe must run with exactly eight ranks.
Each MPI rank must run on a separate physical processor.
Which command should you use?

A.
job submit /numcores:8 mpiexec /affinity App.exe

B.
job submit /numnodes:4 mpiexec /cores 2 App.exe

C.
job submit /numsockets:8 mpiexec /affinity App.exe

D.
job submit /numnodes:2-4 mpiexec /cores 2 /affinity App.exe