Elijah Hamilton is the payroll accountant at White Box Builders. He is preparing an information package about voluntary and fringe benefits. Using the following list of fringe benefits, classify each benefit as pre-tax or post-tax and as taxable or tax-exempt for federal income taxes. (Select "X" where applicable else "NA".) Fringe Benefit 401(k) Medical Insurance Off-site gym membership United Way contributions AFLAC Tuition assistance up to $5,250 annually Commuter passes up to $270 monthly Employee Benefits Pre-tax Post-tax Taxable: Tax exempt