Let $f:\left(-1,1\right)\to \mathbb{R}$ be defined as $f\left(x\right)=\max \left(-\left|x\right|,-\sqrt{1-x^2}\right)$, then number of points where it is non-differentiable are equal to (a) 1 (b) 2 (c) 3 (d) 4

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