You are an application developer.
You plan to debug a Microsoft Message Parsing Interface (MPI) application by using the MPI Cluster Debugger. You set appropriate breakpoints in the application. You need to evaluate the value of a variable on different MPI ranks when a breakpoint is encountered. What should you do?

A.
Place the mouse pointer on top of the variable.

B.
Add the variable to the Watch window.
Use the Modules window to switch between MPI ranks.

C.
Add the variable to the Watch window.
Use the Threads window to switch between MPI ranks.

D.
Add the variable to the Watch window.
Use the Processes window to switch between MPI ranks.