Which of the following descriptions about DHCP Snooping is wrong?

Which of the following descriptions about DHCP Snooping is wrong?
A . If the DHCP Snooping function is enabled in the interface view, all DHCP message command functions under the interface will take effect.
B . DHCP Snooping can prevent illegal attacks by setting trusted ports
C . Enable DHCP Snooping globally. Without any post-parameters, the device only processes DHCPv4 messages by default.
D . If the DHCP Snooping function is enabled in the VLAN view, the command function will take effect on the DHCP messages belonging to the VLAN received by all interfaces of the device.

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Answer: C