Question 2

B and E are correct commands to remove an empty directory.

To remove an empty directory like Downloads, the command `rmdir Downloads` is appropriate, as it specifically removes directories that are empty. Additionally, the command `rm -r Downloads` can be used to remove directories and their contents recursively, which includes the case where the directory is empty.

A) undir Downloads

This option is incorrect because `undir` is not a standard command in Unix-like operating systems for removing directories. It does not exist in common command-line environments, and therefore cannot be used to remove the Downloads directory.

B) rmdir Downloads

This option is correct because `rmdir` is designed specifically to remove empty directories. Since the question states that Downloads is empty, this command will successfully execute without any errors.

C) dir -r Downloads

This option is incorrect as `dir` is typically used to list the contents of directories, not to remove them. The `-r` flag does not apply to the `dir` command in a way that would facilitate the removal of the directory.

D) rem Downloads

This option is incorrect because `rem` is not a valid command for removing directories in Unix-like systems. It is often used in DOS and Windows batch files for comments, but it does not serve the purpose of deleting directories.

E) rm -r Downloads

This option is correct because `rm -r` is the command used to remove directories and their contents recursively. Even if the directory is empty, this command will successfully remove the Downloads directory without errors.

Conclusion

Options B and E are the only correct choices for removing the Downloads directory, with B specifically designed for empty directories and E capable of handling both empty and non-empty directories. All other options either do not exist or do not serve the purpose of removing a directory, thus failing to meet the requirements of the question.