The IUPAC name of the following compound is :

Question

$ (a)\;3,4,4 -Trimethylheptane \\(b)\;3,4,4 - Trimethyloctane \\(c)\;2- Butyl -2-methyl-3 -ethylbutane \\(d)\;2-Ethyl-3,3-dimenthylheptane $