What effects does alert acknowledgement have?

I've tried digging through previously asked questions and the KB, but I can't find a definitive answer for this question.

Consider this scenario:

Node A goes down and an email alert is triggered.

Tech owner logs in to the web console and acknowledges the alert.

What happens next?

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‌tthe alert is marked as acknowledged, removed from unacknowledged alerts list & if someone else looks, they can see someone has at least seen the alert. If you're the only operator, not much use.
if you have alert escalations configured, these can be set to suppressed if an alert is acknowledged
after 10 days if the trigger conditions are still true, the alert will be retriggered as a reminder

I'm not suggesting any of the above are good or bad - it depends on your requielements. I personally do not use acknowledgements at all.