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What is the derivative of $f( x ) =-\cfrac{ 3}{x^3 }$ with respect to $x$?

$f^{ \prime }( x ) =\cfrac{9}{x^{2}}$

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

$f^{ \prime }( x ) =\cfrac{9}{x^{4}}$

$f^{ \prime }( x ) =\cfrac{3}{x^{4}}$