Valiquette brought his own lunch to school today, but now a friend, Shaw, has asked him to join her for lunch at
the Campus diner. Valiquette indicated his interest, but asked Shaw whether she would be paying for his lunch. She said... no. Select the correct statement from Helton's point of view:
a. The cost of the lunch brought represents an opportunity cost of dining with his friend.
b. The cost of the lunch brought is relevant to the decision to have lunch with his friend.
c. The cost to buy lunch at the deli is not relevant because it has not yet been incurred.
d. All of the above represent correct statements related to relevant costs.