Which domain should I submit to Yahoo?

Site has multiple domains for same website

[fom2001uk]

New site has various domains such as newsite.org.uk, or
newsite.co.uk

They all point to the same place and the address resolves to organisation.com/newsite

But when I'm registering this site with Yahoo, which URL should I include in the form? One of the short URLs or the destination URL?

Does it even matter?

[2_much]

I would use one of the unique domains. Yahoo may not allow you to list the site.com/newsite, whereas it would be easy to list a brand new domain.
If you are in the UK, I would use the .co.uk.