The graphs of f and its first derivative are shown below (the derivative is the darker curve). How many critical points does this function have in the interval x = -1 to x = 4? WINDOW Xmin= -1 Xmax=4 Xscl=1 Ymin= -1 Ymax=3 Yscl=1 Xres=1 2. The derivative crosses or touches the horizontal axis twice, at x = 0 and x = 3. O 2. The derivative has one peak and one valley, at x = 0 and x = 2. 1. The derivative only crosses the horizontal axis once, at x = 3. None. The intersection of the two curves does not occur on the horizontal axis. 2. The function crosses the horizontal axis twice, at x = 2 and x = 3.6