A wooden block slides 3 m towards east on a rough horizontal floor while a constant wind force of 2 N acts towards east and kinetic friction of 4 N acts towards west. Which option correctly states the sign of work done by these two forces during the motion?
a) Wind: positive, Friction: positive
b) Wind: positive, Friction: negative
c) Wind: positive, Friction: zero
d) Wind: negative, Friction: positive