Let \( f(x)=\left\{\begin{array}{l}-1, \quad-2 \leq x0 \\ x^{2}-1,0 \leq x \leq 2\end{array}\rig...

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Let \( f(x)=\left\{\begin{array}{l}-1, \quad-2 \leq x0 \\ x^{2}-1,0 \leq x \leq 2\end{array}\right. \) and \( g(x)=|f(x)|+f(|x|) \). Then, in the interval \( (-2,2), g \) is :
\( \mathrm{P} \)
(1) not differentiable at two point
(2) not continuous
W
(3) not differentiable at one point
(4) differentiable at all points
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