Which of the Following Items Is Counted in U

Which of the following items is counted in U.S.GDP?

A) final goods and services that are purchased by the U.S.federal government
B) intermediate goods that are produced in the U.S.but which are unsold at the end of the GDP accounting period
C) goods and services produced by foreign citizens working in the U.S.
D) All of the above are included in U.S.GDP.