Which of the following ls command options is used to display hidden files and directories?

In Linux and Unix-like operating systems, files and directories that begin with a dot (.) are considered hidden and are not shown by default with the `ls` command. The `ls -a` option (or `--all`) specifically instructs the `ls` command to list all entries, including these hidden dotfiles and dotdirectories.

The `ls -s` option displays the size of each file in blocks.

The `ls -l` option displays files in a long listing format, and `h` is for human-readable sizes, but neither alone nor together shows hidden files.

The `ls -t` option sorts the output by modification time, with the newest files appearing first.