What value to determine if a packet with the source IP of a gateway in the cluster is being spoofed?

Extended Cluster Anti-Spoofing checks what value to determine if a packet with the source IP of a gateway in the cluster is being spoofed?
A. The source IP of the packet.
B. The packet has a TTL value of less than 255.
C. The source MAC address of the packet.
D. The destination IP of the packet.

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