The _Open data view sounds like the way to go. That should give us the specific list of subscribers we need to target. I feel pretty confident about this one.
B) _Open data view - definitely the way to go. It's like finding a needle in a haystack, but with the _Open data view, it's more like finding a haystack in a needle. Wait, that doesn't sound right...
C) Tracking Data Extract - I'm not sure if this is the best option, but it sounds like it might give more detailed information than just the total opens.
Alonso
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