Identify each item as relating to Social Security tax, Medicare tax, or both. A. Earnings threshold over which no tax is levied Social Security tax Medicare tax Both B. Earnings threshold over which additional tax is levied Social Security tax Medicare tax Both C. 6.2% tax rate Social Security tax Medicare tax Both D. Must be withheld from employee earnings by the employer Social Security tax Medicare tax Both E. 1.45% tax rate Social Security tax Medicare tax