Recently, you've become the Network Admin for a large company and are evaluating legacy systems. A particular server of unknown purpose was probed with a port scan, revealing it has port 21 open, port 22 closed, and other ports are showing as filtered. What does this indicate about the server?
It's safe to turn off the server since it's not actively used
The firewall is configured to permit web traffic exclusively
The server is not functioning and unable to connect
An FTP service is operational on the server