Robert is a citizen of Germany. He decides to come to the United States to open a car dealership in Chicago. Robert does not obtain a Green Card, but procures a visa to work in the United States. He is physically present in the United States during the following periods: 20X1 (April 1 through July 30) 20X2 (June 1 through August 15) Which of the following best describes Robert in 20X2? Question 17 options: 1) Robert is a resident alien under the lawful permanent residence test. 2) Robert is a U.S. citizen and taxed on his worldwide income. 3) Robert is taxed on only his U.S.-source income. 4) Robert is a nonresident alien if he has applied for a green card.