You started a new position as a Network Administrator at a large corporation. You have been tasked with determining if some older infrastructure is in use. After running a port scan on a server you can't seem to find any documentation on you find it is listening on port 21. Port 22 returns from the scanner as CLOSED. All other ports return as FILTERED. Based on this information which statement is true?
The server is not in use and can be shutdown
The server is behind a firewall that allows HTTP traffic
The server is running an FTP server
The server is offline and not responding