What is the reason that ProfiNET frames are discarded by default on Catalyst switches?

What is the reason that ProfiNET frames are discarded by default on Catalyst switches?
A. ProfiNET uses a nonstandard Ethernet frame format
B. The frames have an 802.1q tag with VLAN ID equal to 0 (zero)
C. Catalyst switches do not support ProfiNET traffic
D. A ProfiNET VLAN must be configured and enabled on a Catalyst switch

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