A cybersecurity adminstraor is using iptables as an enterprise firewall. The administrator created some rules, but the network now seems to be unresponsive. All connections are being dropped by the firewall. Which of the following would be the best option to remove the rules?

a$.$ # iptables $-$t mangle $-$x

b$.$ # iptables $-$f

c$.$ # iptables $-$z

d$.$ # iptables $-$p input $-$j drop