Yep, remember that you are making the same stitch either way. When you make it with the flat V side facing you, that is a knit. When you make the same stitch with the bumpy side facing you., you are purling.
So when you knit every row, or if you purl every row, you get the same stitch.
If you stretch out your garter from #1 (where you knitted every row) you might see that it is a lot like #3?
By the way, in the picture Ingrid posted, the back side would have knits in the middle - Vs - and the side bits would be purls.
P.S. I love your descriptions of the appearance of both sides, especially the unununun, because it makes such a great sound in my head! What a great word. 'I am on an ununununun row'.