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What is the derivative of $f( x ) ={ 15e }^{ x },$ with respect to $x$?

$f^{ \prime }( x ) =\dfrac{ 15}{ xe }$

$f^{ \prime }( x ) ={ 15e }^{ x }$

$f^{ \prime }( x ) ={ \dfrac{15x}{e }}$

$f^{ \prime }( x ) ={ \dfrac{15}{e} }$