IUPAC Naming of Alkynes

b) $$CH_3 - \underset{\text{|} \atop CH_3}{CH} - \underset{\text{|} \atop CH_3}{C} \equiv \underset{\text{|} \atop C_2H_5}{C} - CH_3$$

This question includes visual content: A chemical structure of a branched alkyne is shown. The main chain contains a triple bond between two carbon atoms. The top carbon of the triple bond is connected to a methyl group ($CH_3$) and another carbon atom. The second carbon above that is bonded to a methyl group and the start of the chain ($CH_3$). The bottom carbon of the triple bond is bonded to an ethyl group ($C_2H_5$) and a methyl group ($CH_3$).