Now, I suspect the answer is c. As this is how to "delete a file". For the same result, in windows, you can hold shift then press delete, and it will permanently delete it in the same way.
However, when you a delete a file, the file is not physically removed from the disk until that files sector('s) (sectors are the smallest addressable unit of a hard drive) is overwritten (works a bit differently for ssd's).
