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What is the derivative of $f( x ) ={ 8x }^{ -4 }$ with respect to $x$?

A

$f^{ \prime }( x ) =-\cfrac{2}{x^3}$

B

$f^{ \prime }( x ) =-\cfrac{32}{x^{3}}$

C

$f^{ \prime }( x ) =-\cfrac{2}{x^{5}}$

D

$f^{ \prime }( x ) =-\cfrac{32}{x^{5}}$

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