Paul's (66, not a dependent) filing status is Single. His gross income, all from wages, is $13,560. There were no taxes withheld from his income and he does not qualify to claim any credits. Which of the following is true

Paul is required to file a return. 

There is not enough information to make a determination.

 Paul is not required to file a return but should file. 

Paul is not required to file a return and should not file.