Which of the following is the correct sequence of
events in the origin of life ?
I. Formation of protobionts
II. Synthesis of organic monomers
III. Synthesis of organic polymers
IV. Formation of DNA-based genetic systems
(1) II, III, I, IV
(2) II, III, IV, I
(3) I, II, III, IV
(4) I, III, II, IV