Which communication method is used by the Modbus protocol?
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- ○ It uses OSI Layer 2 and both the primary/secondary devices send data based on a matching token ring.
- ○ It uses OSI Layer 2 and the secondary device sends data based on request from primary device.
- ○ It uses OSI Layer 2 and both the primary/secondary devices always send data during the communication.
- ○ It uses OSI Layer 2 and the primary device sends data based on request from secondary device.