A network administrator is troubleshooting an issue with a newly installed web server. The web server is available to internal users but unavailable to Internet users. The server’s network configuration is shown below:
Which of the following is the MOST likely reason why the server is unavailable from the Internet?
A. NAT has not been configured on the border firewall.
B. The Layer 3 switchport connecting the web server is blocking port 80.
C. The gateway IP has been incorrectly configured.
D. The configured DNS server is not reachable by the web server.