Which one of the following is NOT a copolymer? (a) Buna-S (b) Neoprene (c) \( \mathrm{PHBV} \)

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Which one of the following is NOT a copolymer?
(a) Buna-S
(b) Neoprene
(c) \( \mathrm{PHBV} \)
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