{ 1 } - divine revelation (especially the Bible).
{ 2 } - human reason (especially Aristotle).
{ 3 } - both of these.
{ 4 } - neither of these.

Aquinas's moral philosophy is based on human reason and mostly follows Aristotle. Its norms, called natural laws (moral laws), are knowable from natural reason and do not require Christian revelation (which Aristotle lacked).

Aquinas's moral theology requires Christian revelation. It adds further norms, called divine laws (revealed laws), and a larger religious context for viewing reason's natural laws.