3.22. Which of the following statements is correct?

1. [1] If government wishes to decrease the equilibrium level of income, it can increase G and leave t unchanged.
2. [2] If government wishes to increase the equilibrium level of income, it can increase G and decrease t.
3. [3] If government wishes to reduce the equilibrium level of income, it can decrease t.
4. [4] If government wishes to reduce the equilibrium level of income, it can increase G.
5. [5] If government wishes to reduce the equilibrium level of income, it can decrease G or
6. decrease t, but it cannot do both.