Susan switches from going to Speedy Lube for an oil change to changing oil in her own car herself. Which of the following is correct? The value of changing the oil is A) included in the GDP whether Susan changes the oil or pays Speedy Lube to do it B) included in the GDP whether Susan pays Speedy Lube to change it but not to change it herself C) included in the GDP if Susan changes it herself, but not if she pays Speedy Lube to change it D) not included in the GDP if neither Susan or Speedy Lube changes the oil