23. A student gave a molecule the following name: 3-methyl-4-isopropylpentane. What is the correct IUPAC name? (A)4-isopropyl-3-methylpentane (B)2-isopropyl-3-methylpentane (C)1,1,2,3-tetramethylpentane (D)2,3,4-trimethylhexane (E)3,4-dimethylheptane