The Graph Of $f(x)$ Is Given in the Following Figure $f^{\prime}(x)$ At the Point

Multiple Choice

The graph of $f(x)$
is given in the following figure.What happens to $f^{\prime}(x)$
at the point $x_{1}$
?

A) $f^{\prime}(x)$
has an inflection point.
B) $f^{\prime}(x)$
has a local minimum or maximum.
C) $f^{\prime}(x)$
changes sign.
D) none of the above