The limit of the difference quotient, -2, from Part 1 above is (select all that apply). A. the instantaneous rate of change of f at : = 5. B. the average rate of change of f at a: = 5. c. f(5). D. the slope of the tangent line to the graph of y = f(x ) at a = E. the slope of the secant line to the graph of y = f(x ) at a = 5. OF f