2. What is the IUPAC name for the following compound?

(A) (S)-2-methyl-2-bromobutanone
(B) (S)-2-bromo-2-methylcyclobutanone
(C) (R)-2-bromo-2-methylcyclobutanone
(D) (S)-1-bromo-1-methyl-2-cyclobutanone
(E) (R)-1-bromo-1-methyl-2-cyclobutanone

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