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# Graphical Interpretation: Intervals of Concave Up

APCALC-97D@8B

Given the graph of $f'(x)$ above (consisting of a triangle and semicircle), on which interval(s) are $f(x)$ concave up?

A

$(-4, 0)$

B

$(-2, 4)$

C

$(0, 8)$

D

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