A server is being used as a smurf amplifier, whereby it is responding to ICMP Echo-Request packets sent to its broadcast address. To disable this, which command needs to be run?
A. ifconfig eth0 nobroadcast
B. echo "0" > /proc/sys/net/ipv4/icmp_echo_accept_broadcasts
C. iptables -A INPUT -p icmp -j REJECT
D. echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
E. echo "1" > /proc/sys/net/ipv4/icmp_echo_nosmurf
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