40. What is the correct IUPAC systematic name for the compound below?

(A) (2R,3S,E)-3-ethyl-6-methylhept-4-en-2-ol
(B) (2S,3R,E)-3-ethyl-6-methylhept-4-en-2-ol
(C) (2S,3R,E)-3-ethyl-2-hydroxy-6-methylhept-4-en
(D) (2R,3S,E)-3-ethyl-2-hydroxy-6-methylhept-4-en

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