If full-employment real GDP is at income equal to $3,600, what changes in government spending and taxing would be necessary to achieve equilibrium at full employment in the economy described by the equations below if the government has to balance its budget, given the simplifying assumptions of the Keynesian model? C = $200 0.80(YD) I = $400 G = $200 T = $200 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Increase G by $80 and decrease T by $100 Your answer b Increase both G and T by $100 c Increase both G and T by $400 d Increase G by $400 and decrease T by $400