What "rich black" does AI use?

If I set my prefs to "Output All Blacks as Rich Blacks" what is the CMYK breakdown of this black? I usually make my own rich black, based on what kind of printing I'm doing (and set the pref to output accurately), but I was just curious what AI uses and why.

@Bernie X:
Here's some "fact", not "theory". Your printer is not printing Registration… guaranteed. They fix it and don't tell you (and don't bother calling the sales guy since he would NEVER tell you the truth of it… another guarantee.)
The interactions of ink on paper dictate a specific total ink coverage and there is not a combination (though there could be some hyper-substrate I've never seen, though unlikely - definitely not just "coated stock") that would properly withstand this level of ink saturation. Ink would be offsetting on the other sheets like mad! Even if you dried between press passes (which would add days to your print job - not economically feasible and no printer in their right mind would do it regularly) and added driers and whatnot, at a certain point ink is not going to trap properly (and I'm talking about ink-to-ink trapping).
And since you want to toss around credentials, I've been doing Prepress (conventional and electronic), running many different presses (web, offset, flexo, etc), and even bindery for 23 years,  and commercial art for 30 years. I'm the guy that fixes the files people like you send in - and as a pressman I would have kicked those plates back to PrePress the minute I saw them (if they happened to get through, and as any knowledgeable pressman would do).
Just an FYI, the ISO standard for Rich Black is 50c 40m 40y 100k. This is also accepted in the GraCol7 standard though there is some anecdotal evidence that sub-Dmax Black values (ie. 93-97% Black) may actually visually appear darker in print.
PS: Your PDF can prove nothing. It's the apple, not an orange. It is a distant cousin to the plates that were on press when your job was printed. And BTW, opening your PDF it's immediately obvious that the file needs to be fixed.

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