An operator is asked to shutdown the telnet service for security reasons. What are the appropriate commands to achieve this?（）

• A、comment out telnetd in /etc/services refresh -s inetd
• B、comment out telnetd in /etc/inetd.conf refresh -s inetd
• C、comment out telnetd in /etc/rc.tcpip refresh -s telnetd
• D、comment out telnetd in /etc/inetd.conf refresh -s telnetd