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