I don't think any of them achieve anything. You can bring a horse to water, but you can't make them drink. It's easier to forcefully hydrate a horse (IV fluids) than to make someone learn.
If they're deliberately missing from class then chances are high that they wouldn't be productive in the class either.
I would say that option 4 would achieve the most, because it avoids the harm that the first 3 create.
Its partially a well check. A kid missing school can be alarming. What if they were kidnapped by a parent? Etc. Happens all the time, and the truent checks give important info id imagine
