Let f be a twice-differentiable function such that f"(x) < 0 for all x. The graph of y = S(x) is the secant line passing through the points (3, f (3)) and (5, f (5)). The graph of y = T(x)
is the line tangent to the graph of f at x = 4. Which of the following is true?
a) f (4.2) < S(4.2 ) < T(4.2)


b
b) f (4.2) < T(4.2 ) < S(4.2)


c) S(4.2) < f (4.2 ) < T(4.2)


d)T(4.2) < f (4.2 ) < S(4.2)