A Linux administrator built a GitLab server. Later that day, a software engineer tried to access the server to upload the repository during the final step of installation. The software engineer could not access the website. Which of the following firewall rules would allow access to this site? 

Answer options:

A. iptables "A INPUT "p tcp "m multiport --dports 80,443 "m conntrack "cstate NEW, ESTABLISHED "j ACCEPT
B. iptables "A INPUT "p tcp "m multiport --dports 80,443 "m conntrack "cstate ESTABLISHED "j ACCEPT
C. iptables "A INPUT "p tcp "m multiport --dports 80,443 "m conntrack "cstate RELATED, ESTABLISHED "j ACCEPT
D. iptables "A INPUT "p tcp "m multiport --dports 80,443 "m conntrack "cstate NEW, ESTABLISHED "j REJECT

C

Reference: https://serverfault.com/questions/578730/when-using-iptables-firewall-rules-why-assert-new-state-on-all-allowed-ports