Differentiability at a point: algebraic (function isn't differentiable)

The figure shows the graph of a function. At the given value of x, does the function appear to be differentiable, continuous but not differentiable, or neither continuous nor differentiable?x = -1Select one:A. DifferentiableB. Continuous but not differentiableC. Neither continuous nor differentiable

SOLVED:List the points in the graph at which each function is not differentiable.