The function $\mathrm { f } ( x )$ has derivative $\mathrm { f } ^ { \prime } ( x )$.
The diagram below shows the graph of $y = f ^ { \prime } ( x )$.
Which point corresponds to a local minimum of $\mathrm { f } ( x )$ ?
\includegraphics[max width=\textwidth, alt={}, center]{97c6fb21-c7fc-444b-ab68-96504e285600-15_945_1321_641_404}