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Which of the following functions has $2$ points of inflection?

A

$f(x)=( x+3 )^{4} $

B

$f(x)=(x+3)(x-3) $

C

$f(x)=(x+3)(x-3)(x-1) $

D

$f(x)=(x+2)(x-2)(x+1)(x-1)$

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