Can anyone clarify the genetics on this one... and prove it somehow?

I've heard:

Sour D x Durban Poison
OG Kush x Durban Poison, and
a mix of Shiva, Skunk, AK-47, and Northern Lights

So I don't really know who to believe. I did just try this strain tonight and it was pretty good. It was excellent smoke, but it really wasn't anything more special than some of the other top-shelf stuff I've sampled recently.