They no longer exist in newer versions of Photoshop/ACR, as they were deprecated by the ACR developing team.
Here's the link to the ACR forum:
This issue has been discussed over there at length.
I'm convinced that the deprecation of this functionality has reduced the efficacy of Camera Raw under some conditions.
But for those images the automatic CA detection and correction algorithms work on (which in all fairness is most images), the result is very good.