Write the IUPAC name for the following organic compound. Use standard IUPAC nomenclature. Select the correct answer from the given options.
a) 3-Ethyl-2,4-dimethylpentane
b) 2-Ethyl-3,4-dimethylpentane
c) 2,4-Dimethyl-3-ethylpentane
d) 2,4,5-Trimethylhexane