1. Which of the following is true of a decision model? a. It can be used only to make short-term or tactical decisions. b. It can be used to structure the decision maker's thinking. c. It does not assess qualitative factors like quality, trust, etc. and hence cannot be always relied upon. d. It can be relied upon to ensure that decisions are automated and free from human interference. 2. Which of the following statements is true of relevant costs? a. They are sunk costs that differ across alternatives b. They are future costs that do not differ across alternatives c. They are future costs that differ across alternatives. d. They are sunk costs that do not differ across alternatives. 3. Which of the following is true of an opportunity cost? a. It is the difference between the summed costs of two alternatives in a decision. b. It is the cost that is not affected by any future action. c. It is the benefit sacrificed or foregone when one alternative is chosen over another. d. It is the cost that has already been incurred and cannot be recovered