In a distributed (MPP) CAS server, how are the machines divided into controller(s) and worker(s)?

In a distributed (MPP) CAS server, how are the machines divided into controller(s) and worker(s)?
A . Each machine includes a session controller and a session worker.
B . One machine is designated as the controller and one or more machines are designated as the workers.
C . One machine is designated as the controller and two or more machines are designated as the workers.
D . One machine is designated as the controller and a worker, and one or more machines are designated as workers.

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Answer: B