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.