Differentiate the Given Function $$f ( x ) = e ^ { - 5 x }$$

Multiple Choice

Differentiate the given function. $$f ( x ) = e ^ { - 5 x }$$

A) $x = - 5 e ^ { - 5 x }$
B) $x = - 5 x e ^ { - 5 x }$
C) $x = e ^ { - 5 x }$
D) $x = - 5 e ^ { - 5 x - 1 }$