Of the options, c) is probably best.
Fans suck air in roughly equal directions from the side and rear, but blow a fairly well defined jet, so you want to suck the smokey air and send it directly out. You would also have to let fresh air in of course; you want to create a good circulation dragging good air in, and blowing smokey air out.
However, putting the fan just outside the appartment and blowing fresh air in at low level, and letting the smokey air out at high level should be about as good I would think.
a) would tend to recirculate the smoke, so isn't as good, and b) isn't as good because the smokey air is likely to be hotter, and will tend to rise, so you'll tend to blow the cleaner air out.
In summer if the outside air is a lot hotter, putting the fan on the ground inside will suck the colder, smokier air from the appartment, and take the smoke with it, and the hot, fresh air will rise to the ceiling, and will get faster clearance.