The function f defined by $f(x) =(x+2)e^{-x}$ is

Question

$\begin{array}{1 1} decreasing\;for\;all\;x \\ decreasing\;in\;(-\infty,-1)\;and\;increasing\;in\;(-1,\infty) \\ increasing \;for\;all\;x \\ decreasing\;in\;(-1,\infty)\; and\;increasing\;in\; (-\infty,-1) \end{array} $