A carpenter used a crowbar to pull larger nails hammered deep in a hardwood. When does effort force become lesser in using this simple machine?

I. When the distance of effort and fulcrum is increased
II. When the distance of the load from the fulcrum is decreased
III. When more effort force is added
IV. When pulling farthest from the fulcrum is done

a.

I, II, III

b.

I, III, IV

c.

I, II, IV

d.

I, II​