you are configuring the host firewall on a Linux system and want to make sure that the packets sent by the ping program are not processed by the system. Which command should you use?

a$.$ iptables $-$A INPUT $-$p icmp $-$j DROP

b$.$ iptables $-$A INPUT $--$dport icmp $-$j DROP

c$.$ netfilter $-$A INPUT $-$p icmp $-$j DROP

d$.$ netfilter $-$A INPUT $--$dport icmp $-$j DROP