The graph of f{:r:) is shown: How many horizontal tangent lines does f(:n) have? The graph of the derivative of a function, f, is shown. Use the graph to determine the interval on which fis increasing. Which is the best description of the graph of the derivative of a parabola that opens downward? O A. a straight line with a positive slope O B. a straight line with a negative slope O C. a horizontal line that is above the x-axis O D. a horizontal line that is below the xaxis O E. a parabola that opens upward The graph of the derivative of a function f crosses the xaxis 3 times. What does this tell you about the graph of f ? O A. The function f also crosses the xaxis 3 times. 0 B. The function f crosses the y-axis 3 times. 0 C. The function fis a parabola. O D. The function fhas 3 horizontal tangent lines. 0 E. The function fhas 2 horizontal tangent lines