Okay, let me break this down. Stratified sampling groups the population into similar strata, which should reduce the variability within each stratum. That means we can get a precise estimate with a smaller sample size. I'll go with B.
Okay, I think I've got this. I'll set the subscriber key as the primary key, and then relate the email address column to that. That should do the trick!
I'm a bit confused by the terminology here. What exactly is a "Fallback Persistence Profile" and how does that relate to the persistence profile types listed? I'll need to do some research on this.
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