Determine where the given function is concave up and where it is concave down. f(x)=x3+ 12x2-x-24 O Concave up on (-00, -4), concave down on (-4, co) 0 Concave down on (-oo, -4) and (4, no), concave up on (-4, 4) O Concave down for all x O Concave up on (-4, co), concave down on (-00, -4)