4 4 f ' -4 -2 4 -2 -4 (i) Identify the critical numbers of f. (Enter your answers as a comma-separated list.) X = -1,0,1 X (ii) Identify the open interval(s) on which f is increasing or decreasing. (Enter your answer using interval notation.) increasing (-0o, - 1), (0,1) X decreasing (-1,0), (1,00 ) X (iii) Determine whether f has a relative maximum, a relative minimum, or neither at each critical number. (Enter your answers as a comma-separated list.) relative minimum X = 0 X relative maximum X = -1,1 X