find the intervals where the graph of fis concave upward, the intervals where the graph of fis concave downward f(x) = x² - 2x³ - 36x + 12 A f(x) is concave upward on (-∞,1) and is concave downward on (1,00) OB. f(x) is concave downward on (-∞,0) and (1,∞), and is concave upward on (0,1 oc. f(x) is concave downward on (-∞,1) and is concave upward on (1,0) OD. f(x) is concave upward on (-∞,0) and (1,0), and is concave downward on (0,1)

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