Which of the following is the correct IUPAC name for the following compound?
A. 2-(1,1-dimethyl ethyl)-5-(1-methyl ethyl) heptane
B. 2-(1,2-diemthyl ethyl)-5-ethyl-6-methyl heptane
C. 3-ethyl-2,6,7,7-tetramethyl octane
D. 6-ethyl-2-,2,3,7-totramcthyl octane.
