Which is a feature of a roth ira?

you must pay tax if you withdraw your earnings once you're 59.5 years old.
you can withdraw your earnings once you're 59.5 years old but must pay a penalty.
you can withdraw your earnings once you're 59.5 years old without paying a penalty.

The right answer for the question that is being asked and shown above is that: "You can withdraw your earnings once you're 59.5 years old without paying a penalty."  a feature of a Roth IRA is that You can withdraw your earnings once you're 59.5 years old without paying a penalty.

I don't know what it is