Which effect of using ingress filtering to prevent spoofed addresses on a network design is true?

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Which effect of using ingress filtering to prevent spoofed addresses on a network design is true?
A . It reduces the effectiveness of DDoS attacks when associated with DSCP remarking to Scavenger.
B. It protects the network Infrastructure against spoofed DDoS attacks.
C. It Classifies bogon traffic and remarks it with DSCP bulk.
D. It filters RFC 1918 IP addresses.

Answer: B