43. Which of the following are constitutional isomers of 4-isopropyloctane?
I. 3-ethyl-2,4,5-trimethyloctane II. isobutylcyclohexane
III. 4-ethyl-2,2-dimethylheptane IV. 4-ethyl-2-methyloctane
(A) I, IV
(B) II, III
(C) I, II
(D) III, IV

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