I'm working on a WordPress website of a little company, let say: `www.xxx.com`.

Now they want a different website for their workshops.

What is the most optimal construction thinking of SEO?

1) `www.xxx.com` + `www.xxx-workshops.com`

2) `www.xxx.com` + `www.xxx.com/workshops`

3) `www.xxx.com` + `workshops.xxx.com`