Which statement is correct regarding ProfiNET communication classes?

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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