a. Graph the function f(x) = x" - 4x + 3. b. Identify the point (a,f(a)) at which the function has a tangent line with zero slope. c. Confirm your answer to part (b) by making a table of slopes of secant lines to approximate the slope of the tangent line at this point. OA. B. O C. OD. TITTIT b. The function has a tangent line with zero slope at (2, - 1). (Type an ordered pair.) c. Complete the table below. (Type integers or decimals rounded to four decimal places as needed.) Interval Slope of the secant line [2,2.5]