How do each of the following events affect the current level of U$.$S$.$ GDP $(Y)$ and its four components $,$ and $Nx?$ For this question, assume that General Motors does all its manufacturing in the United States and that all people and firms are American unless otherwise specified.

a$.$ General Motors sells a car to the Kim family out of its inventory.

b$.$ General Motors sells a car to Avis, the car rental company, out of its inventory.

C$.$ Volvo, the Sweedush car company, makes a car and sells it into an American family.

D$.$ The feseral governemnt gives the Jackson family s tax cut, the proceeds from which the Jacksons save to buy a car in the future.