Suppose comm sz =D 8 and n D =16.
a. Draw a diagram that shows how MPI _Scatter can be implemented using tree-structured communication with comm _sz processes when process 0 needs to distribute an array containing n elements.
b. Draw a diagram that shows how MPI _Gather can be implemented using tree-structured communication when an n-element array that has been distributed among comm sz _processes needs to be gathered onto process 0.