vCAC 6.0 Multi Tenancy and AD

Hi all, I'm playing with VCAC 6 and I am trying to understand the depth of Multi Tenancy without using vCD underneath.

Can I have vCAC 6.0 pointing to 2 different companies AD setups thus providing Multi Tenancy at that level (Multi Company), or can it point to only one companies AD thus offering Muti Tenancy within the grouping of this single AD?

Thanks

md