The graph below of
You are looking at the graph of f '(x), but you are being asked to describe the graph of f(x).
A minimum value on f(x) is where the y-values change from decreasing to increasing. How does that show up on the f '(x) graph?
Local minima on f(x) are located anywhere that the graph of f '(x) changes from negative to positive. Local maxima are the reverse.
Points of inflection on f(x) occur where f '(x) changes the sign of its slope. This happens twice.