Which of the following is true about the reaction of 3-bromo…

Which of the following is true about the reaction of 3-bromo-2-methylpentane with potassium methoxide? I.  The reaction is E2 elimination with anti-periplanar substrate configurationII. The reaction is concertedIII. The reaction produces the less substituted alkene due to size of the baseIV. A favorable yield requires high concentration of 3-bromo-2-methylpentane and methanol as the solvent