Which of the following is the least the least stable conformer of 1-tert-butyl-3-methylcyclohexane.
◦ tert-butyl is equatorial and the methyl is equatorial.
◦ tert-butyl is axial and the methyl is axial.
◦ tert-butyl is equatorial and the methyl is axial.
◦ tert-butyl is axial and the methyl is equatorial.
◦ All are equally stable.