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# Find All Points of Non-differentiability, Given a Graph

APCALC-MCYMOL

The graph of $y=f(x)$ is shown. At what values of $x$ in $[-6,6]$ does $f(x)$ appear to be non-differentiable?

A

$x=1$

B

$x=-2, \hspace{.1cm} x=1$

C

$x=-2, \hspace{.1cm} x=3$

D

$x=-2, \hspace{.1cm} x=1, \hspace{.1cm} x=3$