Which statement explains the correct position of a PLC within the CPwE architecture?

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Which statement explains the correct position of a PLC within the CPwE architecture?
A . PLCs are always part of Level 0 C process control.
B . PLCs are part of Level 4 C site business planning.
C . PLCs are part of Level 1 C basic control.
D . PLCs are placed at Level 2 C area supervisory control.

Answer: C