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# Concavity From a Graph of First Derivative

APCALC-8BLKLF

Consider a function $f(x)$ for which the graph of its first derivative is shown.

On which interval(s) is the graph of $f(x)$ concave down?

A

$(0, 2)$ only

B

$(0, 2)$ and $(6, 8)$ only

C

$(2, 4), (4, 6)$ and $(6, 8)$

D

$(1, 3), (4, 5)$ and $(6, 8)$