Ivan is a nonresident alien engaged in a trade or business in the United States. He was in the U.S. for several short periods during the tax year and earned about $30,000 while in the U.S. His wife remained at their residence in Russia. When he files his U.S. return for the year, he: Question 10Select one: a. Must file using the Married Filing Jointly filing status b. Must use the Tax Computation Worksheet for Married Filing Separately returns c. May choose to file as either Single or Married Filing Jointly d. Must file as Single