Regarding protection against IP/ICMP attacks, which of the following statements is correct?

Regarding protection against IP/ICMP attacks, which of the following statements is correct?
A . The principle of defending against IP/ICMP attacks on the user side is to discard the packets whose source IP from the user side is the system IP of the access device.
B . The principle of defending against IP/ICMP attacks on the user side is to discard the messages from the user side whose destination IP is the system IP of the access device.
C . The principle of defending against user-side IP/ICMP attacks is to discard all packets whose source IP is the system IP of the access device.
D . The principle of defending against user-side IP/ICMP attacks is to discard all packets whose destination IP is the system IP of the access device.

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Answer: B