Which of the Following Costs Is Not Relevant to the Decision

Which of the following costs is not relevant to the decision whether to replace an old computer with a new one?

A) The cost of the new computer.
B) The cost of the old computer.
C) The cost of a service plan on the new computer.
D) The cost to repair the old computer if a new computer is not purchaseD.The cost of the old computer is a sunk cost.