Let $f\left(x\right)=\{\begin{array}{cc}-1& -2\le x<0\\ x^2-1& 0\le x<2\end{array}$ if $g\left(x\right)=\left|f\left(x\right)\right|+f\left(\left|x\right|\right)$ then $g\left(x\right)$ in $\left(-2,2\right)$ (A) not continuous (B) not differential at one point (C) differential at all points (D) not differential at two points

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