48. Which of the following is not an option on the W-4? a. additional allowances b. withholding no tax c. additional withholding d. a flat tax 49. Tax withheld from an independent contractor is known as: a. Social Security tax b. federal income tax c. federal unemployment tax d. backup withholding tax 50. An employer whose quarterly employment tax liability is under $2,500 must deposit its taxes no less frequently than: a. monthly b. quarterly c. semi-weekly d. annually