which command needs to disable ICMP Echo-Request packets sent to its broadcast address?

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