Which of the following statements is correct?a. A decrease in the size of a tax always decreases the tax revenue raised by that tax.b. A decrease in the size of a tax always decreases the deadweight loss of that tax.c. Tax revenue decreases when there is a small decrease in the tax rate and the economy is on the downward-sloping part of the Laffer curve.d. An increase in the size of a tax leads to an increase in the deadweight loss of the tax only if the economy is on the upward-sloping part of the Laffer curve.