-
The mouse + browser combo really work well. #3 is a little busier, though. #1 is too general (to me, I would think it has to do with a contact page). #4 is also good - it really emphasizes the "learning" aspect.
I think any one of those three would do well.

Thanks Serina - of #3 or #4, which do you feel will more effortlessly and quick communicate "Learning" to users?