(1 point) Let &, 2, and & be arbitrary real numbers with & # 0, and let f be the function given by the rule f(e ) = a (@ - ) + . Which of the following statements are true about f? Select all that apply. OA. An extreme value occurs at the point (2, *). OB. The graph of y = f (@ ) is a line. C. The maximum value of f(@) is k. D. If & > 0, then f has a global maximum. DE. The graph of & = f (@) is a parabola. OF. If & > 0, then f has a global minimum. OG. None of the above Next we use some calculus to develop familiar ideas from a different perspective. To start, treat a, 2, and & as constants and compute f(@). f( ) = Find a critical value of f. (This will depend on at least one of a, 2, and k.) Critical value = Assume that &