Question 5 1.5 pts 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 retund). he: o is required to file a tax return o is not required to file a tax return but should anyway o is required to file a tax return but should not file because he owes no tax O is not required to file a tax return and should not hle a tax return