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# Find Critical Numbers, Given Graph of f'(x)

APCALC-GBU7QY

Consider the graph of $f'(x)$ shown above.

If $f(x)$ is defined for all numbers in the interval $[-10, 10]$, how many critical numbers does the function $f(x)$ contain in the interval $(-10, 10)$?

A

$3$

B

$4$

C

$8$

D

$9$