The IUPAC name for the following compound is:

$\displaystyle 3,5$-dimethyl-$\displaystyle 4$-propylhept-$\displaystyle 6$-en-$\displaystyle 1$-yne

$\displaystyle 3$-methyl-$\displaystyle 4$-($\displaystyle 3$-methylprop-$\displaystyle 1$-enyl)-$\displaystyle 1$-heptyne

$\displaystyle 3,5$-dimethyl-$\displaystyle 4$-propylhept-$\displaystyle 1$-en-$\displaystyle 6$-yne

$\displaystyle 3$-methyl-$\displaystyle 4$-($\displaystyle 1$-methylprop-$\displaystyle 2$-ynyl)-$\displaystyle 1$-heptene