I think a combination of the last two would be best. The footsteps don't really read well to me.
Showing the overall movement range is important, and the dotted line is the clearest about where the character will walk.
If the exact path a character takes isn't important, then I think you shouldn't show it, just show the overall movement range, and the currently selected target tile. If you highlight the path, it makes it look like it patters, and players will expect to be able to control the exact path.
I'd also think about what other contexts might involve selecting a tile. Attacking, perhaps? It'll probably make for the most intuitive UI if the targeting cursors for selecting tiles are similar in all contexts, changing colour or perhaps changing some icon, but shaped and controlled the same way.