Robert is the network administrator for a small business and recently installed a new firewall. After seeing signs of unusually heavy network traffic, he checked his intrusion detection system, which reported that a smurf attack was under way. What firewall configuration change can Robert make to most effectively prevent this attack?
A. Block the source IP address of the attack.
B. Block inbound UDP traffic.
C. Block the destination IP address of the attack.
D. Block inbound ICMP traffic
Answer: D. Block inbound ICMP traffic
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