Figure 5 shows the graph of a function f that has a continuous third derivative. The dashed lines are tangent to the graph of y = f(x) at the points (0, 2) and (4, 1). Based on what is shown, tell, if possible, whether the following integrals are positive, negative, or zero.
(a)

(b)

(c)

(d)

f(x) dx f'(x) dx f"(x) dx f"(x) dx 0