What is Bert's utility function for Mondays and Tuesdays given that he consumes only vegetables and salt?
a) The array represents the number of x1 and x2 items sold on Mondays and Tuesdays
b) The array represents the number of x1 and x2 items produced on Mondays and Tuesdays
c) The array represents the number of x1 and x2 items in stock on Mondays and Tuesdays
d) The array represents the number of x1 and x2 items ordered on Mondays and Tuesdays