What does it mean for a fiscal policy to be sustainable?
a. The present value of all projected present revenues must be equal to the present value of projected future spending.
b. The present value of all projected future revenues must be equal to the present value of projected O future spending.
c. The future value of all projected present revenues must be equal to the present value of projected future spending.
d. The future value of all projected future revenues must be equal to the present value of projected future spending.