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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Answer: B