Differentiate the Given Function $f ( x ) = e ^ { - 6 x }$

Multiple Choice

Differentiate the given function. $f ( x ) = e ^ { - 6 x }$

A) $x = - 6 x e ^ { - 6 x }$
B) $x = e ^ { - 6 x }$
C) $x = - 6 e ^ { - 6 x - 1 }$
D) $x = - 6 e ^ { - 6 x }$