QUESTION $4$Which of the following is true with respect to the classical macro model? A$.$ Nominals affect nominals and reals donot affect anything. B$.$ Unemploymed resources are "idle" or in surplus because their price is too high. C$.$ The interest rate is a purely nominal variable D$.$ The foundation for effective supply is constituted in a former source of demand.O E$.$ Prices should move to correct supply imbalances only.