You want to create an SSH tunnel for POP and SMTP protocols. Which of the following commands will you run?

This command omits the remote host and remote port for the SMTP -L 25 tunnel, making the syntax invalid and leaving SMTP port forwarding unconfigured.

This command correctly specifies both port forwards and protocol flags but is missing the required username and destination host at the end, so SSH cannot establish the connection.

This command incorrectly maps local port 25 to remote port 110 instead of 25, which cross-maps SMTP to the POP3 port and would not properly forward SMTP traffic to its correct remote port.

The command `ssh -L 110:mailhost:110 -L 25:mailhost:25 -1 user -N mailhost` correctly creates two local port forwards using the syntax local_port:remote_host:remote_port, mapping local port 110 to POP3 and local port 25 to SMTP on mailhost. The -N flag instructs SSH not to execute a remote command, which is appropriate for a pure tunneling session. The -1 flag forces SSH protocol version 1, and the target user and host are properly specified at the end of the command.