Approximate the critical numbers of the function shown in the graph. Determine whether the function has a relative maximum, a relative minimum, an absolute maximum, an absolute minimum, or none of these at each critical number on the interval shown. (Enter your answers as a comma-separated list.) y N W X -2 -1 1 2 3 4 5 6 -1 Approximate the critical numbers. X = List the critical numbers at which each phenomenon occurs. (If an answer does not exist, enter DNE.) relative maxima X relative minima X absolute maxima X : absolute minima X