A remote OpenVMS system can FTP to other hosts, but no system can FTP to the remote system. Which
command is useful in determining the state of the remote FTP server?

A.
TELNET 127.0.0.1/PORT=21

B.
TELNET 127.0.0.1/PORT=24

C.
TELNET <ftp_server>/PORT=21

D.
TELNET <ftp_server>/PORT=24