Which of the following commands is used to remove a directory in Linux?

The command used to remove a directory in Linux is "rmdir." This command specifically targets and removes empty directories. If you attempt to use "rmdir" on a directory that contains files or subdirectories, the command will fail, as its purpose is to ensure that only empty directories are deleted.

In most Linux distributions, this command is a crucial part of managing file system structures, allowing users to keep their directory hierarchy organized by removing directories that are no longer needed.

Other commands like "rd," "del," and "remove" are not standard commands in Linux for removing directories. "rd" is generally associated with DOS or Windows command prompts, while "del" is used to delete files rather than directories. "remove" is not a recognized command in the standard Linux command set.

Using "rmdir" is a straightforward and safe method for directory management within the Linux environment, making it the correct choice for this question.