________________ returns in its second argument the number of processes in the communicator.

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________________ returns in its second argument the number of processes in the communicator.

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Q. ________________ returns in its second argument the number of processes in the communicator.

(A) MPI_Init
(B) MPI_Comm_size
(C) MPI_Finalize
(D) MPI_Comm_rank

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✅ Correct Answer: (B) MPI_Comm_size

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