A Student Gave a Molecule the Following Name: 2-Methyl-4-T-Butylpentane

A student gave a molecule the following name: 2-methyl-4-t-butylpentane
However,the teacher pointed out that,although the molecule could be correctly drawn from this name,the name violates the IUPAC rules.What is the correct (IUPAC) name of the molecule?

A) 2-t-butyl-4-methylpentane
B) 2,2,3,5-tetramethylhexane
C) 2,4,5,5-tetramethylhexane
D) 1-sec-butyl-1,2,2-trimethylpentane
E) none of these