Again there are two definitions of "assault weapon", a functional and a political definition. The political definition is basically just anything which rises much over about an eight on a scale of one to ten for looking scary to demoKKKrats. All three of the weapons pictured would qualify.
The functional definition means something light, easy to carry around, easy to carry lots of ammo around for, just big enough to take an adversary out of the battle, and sufficiently low recoil for rapid and fairly accurate follow-on shots. Closest thing in the world to that to my thinking would be the little lever-action Henry rifle in 22WMR:
That's basically a $350 item on gunbroker.com all day long, generally used for turkeys, coyotes, groundhogs, crows etc., and Barack Oinkbama and the demoKKKrats will probably want to ban it along with ammo for it.