A systems administrator needs to disable root login for SSH. Which of the following commands should the administrator use?

touch creates an empty file or updates its timestamp, and piping its output to awk with this syntax is incorrect for editing file content.

The sed -i 's/PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config command uses sed to perform an in-place (-i) substitution (s/old/new/) on the /etc/ssh/sshd_config file. It specifically changes the line PermitRootLogin yes to PermitRootLogin no, thereby disabling direct root login via SSH.

touch creates an empty file or updates its timestamp, and the print* 1PermitRootLogin/PermitRootLogin no/' syntax is invalid for modifying file content.

cat /etc/ssh/sshd_config | grep 's/PermitRootLogin yes/PermitRootLogin no/' would simply display lines matching the pattern and not modify the file.