CACIB?

I'm a little bit confused here. Filling out entry forms for Tamino for a show in autumn (god knows why ) And I'm having some trouble remembering something.

From which class does the dog get CACIB? is it from Open class, Working Class and Champion Class? Or does Intermediate class compete for the CACIB as well? Cause Tamino would be eligible for entry in both Intermediate and Open.

Can any of you help?