The following is a graph of f' (the first derivative of f). Based on this graph, which of the four graphs shown below could be a graph of f"? f'(x) 3 50 40 30 20 10 -10 2 t6 16 O a) F"(x) 30 20 10 -10 -20 O b) c) f"(x) 35 25 15 5 -5 -15 -25 f(x) 20 10 -10 -20 -30 1 2 2 NI 2 3 3 tes 4 4 4 5 5 5 6 9 6 7 O d) f"(x) 20 10 -10 -20 -30 -40 2