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

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.

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Answer: D