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During an authorized security assessment at a municipal power distribution facility in Omaha, Nebraska, a...

During an authorized security assessment at a municipal power distribution facility in Omaha, Nebraska, a certified ethical hacker performs passive traffic analysis between the control center and several remote substations.

The tester observes structured request-response messages used to read coil status and write register values on industrial controllers. All communication occurs over TCP port 502, and the protocol does not provide built-in encryption or authentication.

Based on these characteristics, which OT communication protocol is operating within this environment?

A.

IEC 60870-5-104

B.

MODBUS

C.

DNP3

D.

OPC UA

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