Give the IUPAC name for the following compound:
CH3CH2CH(CH3)C≡CCH2CH3

a. 3-methyl-4-ethyl-2-hexyne
b. 3-ethyl-4-methyl-2-hexyne
c. 4-methyl-3-ethyl-2-hexyne
d. 4-ethyl-3-methyl-2-hexyne