Which feature must be incorporated into the campus LAN design to enable Wake on LAN?

Which feature must be incorporated into the campus LAN design to enable Wake on LAN?
A . dynamic ARP Inspection Snooping on layer 2 devices
B . directed broadcasts on layer 3 devices
C . proxy ARP on layer 3 devices
D . DHCP Snooping on layer 2 devices

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Answer: B