-3x3 + 3x-x-4 Answer the questions for the function f(x)=-3 A. At the critical number x = OB. At the critical number x = C. At the critical number x = OD. At the critical number x = the function f is concave down and corresponds to a relative maximum of f(x). the function f is concave down and corresponds to a relative minimum of f(x). the function f is concave up and corresponds to a relative minimum of f(x). the function f is concave up and corresponds to a relative maximum of f(x). E. No conclusion can be made using the second derivative test at this critical number. d. Set the formula for the derivative f''(x) = 0 to find any possible inflection points. f''(x) = 0 at x= 1 3 Use the table feature for the graph of f'(x) to examine the concavity of the graph of f(x). What can you conclude? Select the correct choice below and, if necessary, fill in the answer boxes within your choice. A. There is a point of inflection at x= where the graph of f changes from concave down to concave up. The slope of the graph of f at this inflection point is where the graph of f changes from concave up to concave down. The OB. There is a point of inflection at x= slope of the graph of f at this inflection point is OC. No conclusion can be made.