Waterloo CS/BBA vs Honours Math

I'm trying to decide how to use my 3 Waterloo program choices.

I'm definitely applying to Waterloo CS, and if I got into both CS and CS/BBA, I'd choose regular CS. So I'm wondering whether CS/BBA is actually worth using one of my 3 choices on, or whether I should use that spot for Honours Mathematics instead.

A few questions:

Has anyone been rejected from Waterloo CS but accepted to CS/BBA in the same application cycle?

If you apply to CS, are you automatically considered for an alternate offer to Honours Mathematics, or do you have to apply to Honours Math separately?