I filed Form 1040A for 2017 and now realized it has to be 1040NR instead. So I used Sprintax to file 1040NR. Sprintax asked "Have you filed a US federal tax return before?". I filed 1040EZ for 2016 but it has only 4 options to choose for 2016 filed form which are 1040NR, 1040NR-EZ, 1040, and 1040A. Which one should I choose?
