72. What is the correct IUPAC name for the following compound?
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(A) N-ethyl-2,N-dimethylbutanamide
(B) N-ethyl-N-methylisobutyramide
(C) 2,N-dimethyl-N-ethylbutanamide
(D)1-(ethylmethylamino)-2-methylbutanamide

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