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