Match the column-I (various phase of an action potential) with column-II (ionic activity associated) and choose the correct option. Column-I Column-II A. Resting stage of a neuron I. Opening and then closing of the B. Depolarisation phase in the generation of action potential. II. All voltage gated sodium and potassium channels are closed. C. Repolarisation phase in the generation of action potential III. The sodium channels remain opened. D. Absolute refractory phase. IV. Opening of potassium gates and the rushing of potassium

• A. A-II; B-I; C-IV; D-III
• B. A-I; B-II; C-III; D-IV
• C. A-III; B-IV; C-I; D-II
• D. A-IV; B-II; C-III; D-I