Which statement is TRUE regarding the Keynesian cross and the IS curve?
O Investment is fixed in the Keynesian cross and a function of the interest rate in the IS diagram.
O Investment is a function of the interest rate in the Keynesian cross and fixed in the IS diagram.
O Investment is a function of the interest rate in both the Keynesian cross and the IS diagram.
O Investment is fixed in both the Keynesian cross and the IS diagram.