I'm following up on this to see if I can get this individual document taken down. We do our best to keep answer keys and exemplars in the hands of our verified teachers but it's a constant challenge. We appreciate you helping us out.
Thanks also @janderson for pointing out that feature. It's one that we'll look into more. It's always a struggle to balance making these tools convenient to use but not so convenient that they end up on the open Internet.