Which statement is correct regarding ProfiNET communication classes?
A.
ProfiNET-RT traffic is carried in UDP and TCP packets
B.
ProfiNET-NRT is used to carry time critical status information
C.
ProfiNET-IRT requires switches with hardware time scheduling capabilities
D.
ProfiNET-NRT is prioritized as Layer-2 Class-of-Service 1 (CoS 1)
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