According to what we learned in class about fiscal policy, which of the following $.$ statements is true? $($Note: $$s usual, $"$G$"$ represents Government Spending and $"$T$"$ represents Taxes$)$ A decrease in $G$ and an increase in T will both increase GDP An increase in $G$ and a decrease in T will both increase GDP An increase in $G$ and an increase in T will both increase GDP A decrease in $G$ and a decrease in T will both increase GDP