Hmm, D seems a bit odd. No micro-segmentation? I'm not sure I'd want to trust that topology without some serious firewall rules in place. Gotta love those 'It's not a bug, it's a feature' moments, am I right?
The correct answer is B. The administrator can create firewall policies in the switch to secure communication between the PLCs. This is a crucial security measure, as direct PLC-to-PLC communication without a firewall could pose a significant risk.
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