Which of the following functions are not differentiable at `x=0`

Which of the following functions is not differentiable at x=1?

Which of the following function is not differentiable at x=0?f(x)=min{x,sin x}f(x)={[0,x>=0x^(2),x<0( c) f(x)=x^(2)sgn(x)

which of the following function is not differentiable x=1

Which of the following functions is differentiable at x = 0?

Which of the following functions is differentiable at x = 0 ?