The graphs of the derivatives of the functions \(f\), \(g\), and \(h\) are shown above. Which of the functions \(f\), \(g\), or \(h\) have a relative maximum on the open interval \(a\lt x \lt b\) ?

For a function to have a relative maximum, the graph of its derivative would have to change from positive to negative.

Only the graph of \(f'\) changes from positive to negative.