Which of the blowing would BEST address this security concern?

The facilities supervisor for a government agency is concerned about unauthorized access to environmental systems in the event the staff WiFi network is breached.

Which of the blowing would BEST address this security concern?
A . install a smart meter on the staff WiFi.
B . Place the environmental systems in the same DHCP scope as the staff WiFi.
C . Implement Zigbee on the staff WiFi access points.
D . Segment the staff WiFi network from the environmental systems network.

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Answer: D