What does the "not opened email" filter mean?

My coworker and I want to make sure we are using the smart campaign logic properly.

We want to filter by people who have not opened ANY email in the past 90 days but we are a little confused about what the logic is for the "not opened email" filter.

• Does it mean that they have not opened ANY email? (If they have been emailed 5 times and haven't opened a single one)
• Or will it mark people who have been emailed multiple times but maybe didn't open ONE of those emails? (They've received 5 emails, opened 4 of them, but didn't open 1)

If it's the latter, how can we make it the former?

Here's a screenshot of our current logic (bottom filter):