You plan to develop a single program multiple data (SPMD) application by using Windows HPC Server 2008. You use multiple processes to perform intermediate calculations and to provide the results as a single number. You need to ensure that the intermediate results are collected and added together by using a single MPI function.
Which function should you use?

A.
MPI_Send

B.
MPI_Bcast

C.
MPI_Gather

D.
MPI_Reduce