The correct answer is A . The study guide describes all three protocols as supporting deterministic or real-time industrial communication. Ethernet/IP uses standard Ethernet and TCP/IP with an application-layer mechanism that can provide real-time communication when deployed within an appropriate limited range. EtherCAT explicitly provides real-time communication in a primary-secondary architecture and achieves its performance by skipping OSI layers 3 through 6. POWERLINK is also explicitly defined as a real-time communication protocol used mainly for transmitting process data. They do not all follow the complete OSI model because EtherCAT bypasses several layers and POWERLINK primarily uses layers 2 and 7. Client-server behavior is specifically associated with Modbus , and star/ring topology characteristics relate to redundancy mechanisms such as PRP, MRP, and HSR rather than these three industrial protocols collectively.
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