Select the true statement. a. the difference between the maximum profit earned by the sandwich shop and the smoothie stand is $3,500. b. the difference between the maximum profit earned by the sandwich shop and the smoothie stand is $3,200. c. the difference between the maximum profit earned by the sandwich shop and the smoothie stand is $2,700. d. the difference between the maximum profit earned by the sandwich shop and the smoothie stand is $3,000.