Final answer:
The 'ls' command, particularly with the '-l' option, displays a list of files with permissions and owner details which includes the user ID. Neither the 'help' nor the 'date' command would show a user ID in their output.
Step-by-step explanation:
The question asks which of the following command output contains userid:
ls
help
date
Cannot be determined
The contains is key to understanding that we need a command that displays user information. The 'ls' command is used to list files and directories, and when used with the -l (long listing) option, it also shows file permissions, owner (userid), and group. Therefore, the 'ls' command, specifically with the -l option, would potentially show the userid in its output. The 'help' command shows information about builtin shell commands, and the 'date' command displays the current date and time, neither of which would typically display a userid.