What is the correct name for the following compound: 6-metil-3-propilhepta-1,3,5-trieno?

The longest chain containing the triple bonds has seven carbons.
The triple bonds are located between carbons 1 and 3, 3 and 5, and 5 and 7.
The compound has a methyl group attached to carbon 6 and a propyl group attached to carbon 3.
a) 3-propil-6-metilhepta-1,3,5-triino
b) 6-metil-3-propilhepta-1,3,5-trieno
c) 6-metil-3-propilhepta-1,5-diino
d) 3-propil-6-metilhepta-1,5-diino