Which of the following income tax systems would be considered regressive? O All income taxed at 15 percent O No income tax, but all consumption taxed uniformly at 4 percent O Income below $10,000 not taxed, income between $10,000 and $20,000 taxed at 15 percent, income above $20,000 taxed at 25 percent Income below $10,000 taxed at 25 percent, income between $10,000 and $20,000 taxed at 15 percent, income above $20,000 not taxed