Filling FAFSA. confusion over foreign tax

Hi,
We are US citizens but relocated outside of the country for the last 10 years. My wife and I have been filling foreign tax as well as US tax every year. While applying for FAFSA, there was question that
What type of income tax return did your parents file? There are 4 options and out of that 2 options are valid (1040, foreign tax return). I have filed both. what should I select?