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If $f(x)=5x^{3}$, then which of the following must be true?

$\text{I. } f(x)=f(-x)$

$\text{II. } f(-x)=-f(x)$

$\text{III. }3f(x)=f(3x)$

A

$\text{I only}$

B

$\text{II only}$

C

$\text{I and III only}$

D

$\text{II and III only}$

E

$\text{III only}$

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