The function `f(x)=(x^2-1)|x^2-3x+2|+cos(|x|)` is not differentiable at (a)-1 (b)0 (c)1 (d)2

The function `f(x)=(x^2-1)|x^2-3x+2|+cos(|x|)` is not differentiable at (a)-1 (b)0 (c)1 (d)2
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The function `f(x)=(x^2-1)|x^2-3x+2|+cos(|x|)` is not differentiable at (a)-1 (b)0 (c)1 (d)2 A. `-1` B. 0 C. 2 D. 1
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