The names of some compounds are given. Which one not in the `IUPAC` system?

Options

A. (1) `CH_(3)CH_(2)CH_(2)underset(3-"Methyl-4-ethylheptane")(underset(CH_(2)CH_(3))underset(|)(CH)overset(CH_(3))overset(|)(CH)CH_(2)CH_(3))`
B. (2) `CH_(3)underset(3-"Methylbutan-2-ol")(underset(OH)underset(|)(CH)underset(CH_(3))underset(|)(CH)CH_(2)CH_(3))`
C. (3) `CH_(3)CH_(2)underset(2-"Ethyl-3-Methylbut-1-ene")(underset(CH_(2))underset(||)(C)-underset(CH_(3))underset(|)(CH)CH_(3))`
D. (4) `CH_(3)underset(4-"methylpent-2-yne")(C-=C CH(CH_(3))_(2))`

Explanation

According to the `IUPAC` system of nomenclature, the names of different alkyl groups should be listed alphabetically:
`3`-Ethyl-`4`-methylheptane