The IUPAC name for the following compound is :

3-methyl-4-(3-methylprop-l-enyl)-l-heptyne

3,5-dimethyl-4-propylhept-6-en-l-yne

3-methyl-4-(1-methylprop-2-ynyl)-l-heptene

3,5-dimethyl-4-propylhept-1-en-6-yne