For the function on the real line $\mathbb { R }$ given by $f ( x ) = | x | + | x + 1 | + e ^ { x }$, which of the following is true ?
(A) It is differentiable everywhere.
(B) It is differentiable everywhere except at $x = 0$ and $x = - 1$.
(C) It is differentiable everywhere except at $x = 1 / 2$.
(D) It is differentiable everywhere except at $x = - 1 / 2$.
For the function on the real line $\mathbb { R }$ given by $f ( x ) = | x | + | x + 1 | + e ^ { x }$, which of the following is true ?\\
(A) It is differentiable everywhere.\\
(B) It is differentiable everywhere except at $x = 0$ and $x = - 1$.\\
(C) It is differentiable everywhere except at $x = 1 / 2$.\\
(D) It is differentiable everywhere except at $x = - 1 / 2$.