Greg earned $25,500 in 2021 and had $1,500 of federal income taxes withheld from his salary. Assuming that Greg is single, 25 years old, and will have a total tax liability of $1,355 (and thus will receive a $145 refund), he: Multiple Choice is required to file a tax return. is not required to file a tax return but should file a return anyway. is required to file a tax return but should not file because he owes no tax. is not required to file a tax return and should not file a return. None of the choices are correct.