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Bob used to make his own donuts. Now he purchases them from Doug's Donut Shop. How does this change of behaviour affect GDP? Select one: O a. it raises GDP by less than the price of the donuts because now Bob does not work to produce donuts anymore O b. it raises GDP by the additional value of the Wutput Bob produces during the time he saves O c it raises GDP by the price of the donuts O d. it raises GDP by more than the price of the donuts because Bob can do something else during the extra time that he now has