The derivatives of x for the function f ( x 2-x is Oa) f ' (x) = (2-x) 24 -x3 (2-20) 2 Ob) f '(x) = (2-x) x3 - 4x3 (2-20) 2 O c) f ' (x) = (2-20) 4x2 - 24 (-1) (2-x) 2 O d ) f '(x) = (2-x) 4x2 -x4 (2 -x ) e) None of the above