Which of the following commands would you use to display all files and directories in the current directory?

The command used to display all files and directories in the current directory is 'ls'. This command is part of the Unix and Linux operating systems and is widely used in command-line interfaces. When executed, it lists the files and folders present in the directory you're currently working in, providing a straightforward way to view the contents.

The other commands serve different purposes: 'cat' is used to display the contents of a file, 'pwd' prints the current working directory, and 'rm' is a command for removing files or directories. Each of these commands has distinct functions that do not relate to listing directory contents, which solidifies why 'ls' is the correct choice for this particular task.