For each of the following transactions that occur in their lives, identify whether it is included in the calculation of U. S. GDP as part of consumption (C), investment (I), government purchases (G), exports (X), or imports (M). Check all that apply.

a. The state of Pennsylvania repaves highway PA 320, which goes through the center of Swarthmore.
b. Caroline gets a new refrigerator made in the United States. Antonio buys a sweater made in Guatemala.
c. Antonio's employer upgrades all of its computer systems using U. S.-made parts.
d. Caroline's father in Sweden orders a bottle of Vermont maple syrup from the producer's website.