ACT help...

I’m trying to register for the ACT and it wants to know how many years of classes I’ve had.

I take AP classes so rather than taking the class for an entire year, it’s only one semester.

But the class counts as an entire credit.

So should I say that I’ve had 2 years of classes (4 semesters) or 4 years as if I’ve taken 4 classes all year until graduation.

I just don’t want a college to look at that and think I only took a class until my sophomore year…