CampagnoloChorus 11-Speed Chain, Silver

The title says it's a chorus 11 speed chain, but the product description references a chorus 9 speed chain. Which is accurate?

I have athena 11s groupset, this chain will work with my groupset? or Athena gropset has its own and especific chain?

Does this 11 speed campy chain come with a campy 11 speed connecting pin?

Does Campagnolo say that this chain is backwards compatible with their 10 speed systems?