12 O Mark this question Which statement regarding aggregate demand is true? O It expresses an inverse relationship between price level and real gross domestic product (RGDP). O It represents the fixed amount of real gross domestic product (RGDP) that can be produced. O It represents a positive relationship between price level and real gross domestic product (RGDP). O It represents the relationship between price level and the amount of real gross domestic product (RGDP) that producers are willing to produce